mican.

Brit.

/ˈmʌɪkə/, U.S.

/ˈmaɪkə/

Forms: 1600s– mica, 1700s–1800s micae (plural, in sense 1).

Origin: A borrowing from Latin. Etymon: Latin mīca.

Etymology: < classical Latin mīca grain, crumb, particle; further etymology uncertain: perhaps related to ancient Greek μικρός (see micro- comb. form). Compare post-classical Latin mica little spark (1579 in a British source).The use in mineralogy was probably originally contextual in the classical Latin sense, although already in quot. 1681 at sense 1 (following Wormius 1655) the word seems to have been erroneously associated with micāre to glitter or shine (see micant adj.).

Mineralogy.

†1. A small glistening particle of talc, selenite, or other crystalline substance present in large numbers in the structure of a rock. Also: a rock or stone containing such particles. Obsolete.Some quots. for micae may be referring to particles of mica in sense 2.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [noun] > texture > having embedded crystals > crystalline substance in

mica1681

kernel1839

phenocryst1889

idioblast1920

porphyroblast1920

porphyroclast1932

poikiloblast1944

1681 N. Grew Musæum Regalis Societatis iii. 320 Yellow Great-Glist. Ammochrysos, Boetio. So call'd, for that it consists of a great number of glossy sparks almost of the colour of Gold, immersed in a gritty Bed. And by Wormius and others therefore called Mica.

1684 Philos. Trans. (Royal Soc.) 14 745 Sand..with Mica of..Silver like, Gold like [particles].

a1728 J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) i. viii. 170 A pale brown Earth, with very small Micæ in it.

1748 J. Hill Gen. Nat. Hist. I. 556 Dr. Woodward imagin'd the white parts of this as of the other Micæ in general to be Spar.

1776 W. Hamilton Campi Phlegræi II. Pl. xxxxviii (caption) A blackish stone with a shining black mica therein, which pulverizes at the least touch.

1803 H. J. Sarrett New Picture London 114 A great variety of Micæ or spangle stones.

2. Any of a group of monoclinic minerals which are composed of hydrous aluminosilicates of sodium, potassium, magnesium, etc., and occur as minute glittering plates or scales in granite and other rocks, and as crystals with perfect basal cleavage that are readily separable into thin, transparent, heat-resistant, usually flexible laminae (which can be used as a substitute for glass, and for thermal and electrical insulation, etc.).pearl, potash-, water mica: see the first element.

ΘΚΠ

society > occupation and work > materials > derived or manufactured material > glass and glass-like materials > [noun] > glass-like materials

specular stone1577

murra1598

talc1601

isinglass1750

mica1778

Muscovy glass1794

muscovite1850

Vitreosil1909

vitreous silica1925

windolite1927

the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica

glass-stone1601

ice-glass1664

daze1671

glimmer1683

isinglass1750

isinglass-stone1751

marienglas1762

mica1778

sheep's silver1814

1778 Philos. Trans. (Royal Soc.) 69 29 Mica or Glimmer. This..is composed of very thin flexible flakes, more or less large.

1811 J. Farey Gen. View Agric. Derbyshire I. 178 They abound with minute plates of Mica, called Silver, Spangles, &c.

1835 Rec. Gen. Sci. 2 445 Pinchbeck mica, iron pyrites, and titaniate of iron occur as accidental constituents.

1860 J. Tyndall Glaciers of Alps 3 Mica is a crystal which cleaves very readily in one direction.

1889 Harper's Mag. Aug. 400/2 He..painted them [sc. Chinese fans] with gods, with extraordinary birds, and with rare animals; varnished them and covered them with transparent sheets of mica.

1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xxvi. 667 The carbon electrodes..enter through suitable plates and stuffing-boxes, and are insulated with mica and asbestos.

1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) iii. 52 Biotite is much the commonest mica.

1971 Materials & Technol. II. 41 Micas are unaffected by fire, water, acids, and alkalis.

1999 Encycl. Brit. Online (Version 99.1) at Window Since early times, the openings [of windows] have been filled with..lights (panes) of glass or other translucent material such as mica.

Compounds

C1. General attributive.

† mica battery n. Obsolete

ΚΠ

1844 Philos. Trans. (Royal Soc.) 134 42 When a Leyden jar..was subjected to the action of one end of the battery, a charge was readily accumulated, and, of course, still more favourably by means of a mica battery.

1849 H. M. Noad Lect. Electr. (ed. 3) 148 The lacquered knob of the mica battery.

mica goggles n.

ΚΠ

1905 Daily Chron. 10 Aug. 5/6 A polo cap, mica goggles,..and the usual..allowance of lard constituted Burgess's costume.

mica insulation n.

ΚΠ

1891 Philos. Trans. 1890 (Royal Soc.) A. 181 137 I have made many other thermometers of this pattern with mica insulation.

1966 Proc. Royal Soc. 1965–6 A. 289 322 This [electron beam] monitor had a 1 mm thick aluminium front plate separated by thin mica insulation from a 1·5 mm thick brass back plate.

mica plate n.

ΚΠ

1837 D. Brewster Treat. Magnetism 312 The successive thicknesses of the mica plates.

1889 G. M. Hopkins Exper. Sci. xii. 267 Mica plates of suitable thickness are selected by trial in the instrument, and preserved for future use.

1988 Sci. News 30 Apr. 283 The instrument has a pair of curved mica plates that can be moved away from each other or towards each other.

mica-packed adj.

ΚΠ

1909 Westm. Gaz. 9 Mar. 4/3 A new three-point sparking-plug..which has no asbestos or mica-packed joints.

mica-scaled adj.

ΚΠ

a1963 S. Plath Crossing Water (1971) 44 I shone, mica-scaled, and unfolded To pour myself out like a fluid.

mica-topped adj.

ΚΠ

1958 A. Wilson Middle Age of Mrs Eliot iii. 381 David banged his fist on the mica-topped table in front of him so that its little contemporary steel-tube legs rattled.

C2.

mica flap n. the flap of a mica valve.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > control(s) > [noun] > valve > parts of

shank1660

seat1841

mica flap1906

spool1960

1906 J. W. Thomas Ventilation, Heating & Lighting of Dwellings ii. 27 There are many chimney ventilators on the market, some having mica flaps..to shut against a down current.

1986 E. Hall in A. Limon et al. Home Owner Man. (ed. 2) iii. ix. 439 A hinged mica flap is suspended inside the ventilator against this grille.

† mica-powder n. Obsolete rare a form of dynamite in which fine scales of mica are used as the absorbent element.

ΚΠ

1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 131 Mica-powder, a No. 1 dynamite, in which the dope is fine scales of mica.

mica-schist n. [after French micaschiste (1807); compare earlier mica-slate n.] Geology a foliated, crystalline, metamorphic rock composed of alternate layers of mica and quartz and easily split.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > other metamorphics

quartzite1823

mica-schist1826

amphibolite1833

hornfels1854

phthanite1854

hornblendite1874

psammite1882

tourmaline-rock1882

tourmaline-schist1882

jasperoid1898

skarn1901

metagabbro1904

metabasite1907

verdite1908

rodingite1911

siallite1933

tonstein1961

greenlandite1981

1824 H. T. De la Beche tr. Sel. Geol. Mem. in Ann. des Mines Pref. p. x Micaschiste. (Mica Slate.) Essentially composed of an abundance of continuous mica and quartz. The structure slaty.]

1826 R. Mills Statistics S. Carolina 30 Mica-schiste. Talco-Mica Schiste.

1833 C. Lyell Princ. Geol. III. 237 The sterile mica-schist is barely covered with vegetation.

1876 Amer. Naturalist 10 386 The rocks in which the valley is formed are, for the most part, clay slates and gold-bearing mica schists, which are very much curved and twisted.

1939 A. G. Tansley Brit. Islands & their Vegetation viii. xxxix. 799 On the Scottish mountains the arctic-alpine chomophyte communities reach their greatest development in the corries of the mica-schists.

1988 P. Wayburn Adventuring in Alaska (rev. ed.) i. 11 Alaska's most ancient rocks are mica-schists that date back only six-hundred million years.

mica-slate n. [after French micaschiste (1807)] Geology (now rare) = mica-schist n.

ΘΚΠ

the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > schist > varieties of

hammochrysos1706

hornslate1791

hornblende slate1794

horn porphyry1794

horn-schist1799

mica-slate1809

green schist1817

hornblende schist1821

kinzigite1878

phyllite1878

spilosite1882

mylonite1885

1809 Trans. Amer. Philos. Soc. 6 ii. 412 Primitive Rocks. 1. Granite, 2. Gneiss, 3. Mica slate, [etc.].

1877 R. W. Raymond Statistics Mines & Mining 229 A large number of fine lodes, all occurring in limestone and mica-slate.

1923 Jrnl. Ecol. 11 263 Across Adolf Bay is the De Geer Range, composed chiefly of Archaean gneiss and mica-slate.

mica valve n. an air valve consisting of a flap of mica hinged at the top, used esp. in ventilator ducts and shafts.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > control(s) > [noun] > valve > others

washer1596

turncock1702

air cock1709

Jack-in-the-box1728

runner1754

stop-valve1829

three-way cock1838

ball valve1839

relief valve1846

poppet valve1851

plunger valve1854

pot-lid1856

reflux valve1857

screw-down1864

mica valve1880

tide flap1884

tube-valve1884

swing-tap1892

relay valve1894

Schrader1895

pilot valve1900

mixer valve1904

spool valve1908

spill valve1922

safety valving1930

three-way1939

1880 S. S. Hellyer Plumber (ed. 2) xxii. 262 When no convenient place can be found for leaving the mouth of the induct-pipe open to the atmosphere, a mica-valve can be fixed over it.

1909 G. B. Shaw in Trans. Medico-Legal Soc. 6 217 One day on the Health Committee a question came up with regard to a mica valve not being in order.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2022).

单词	mica
释义	mican. Brit. /ˈmʌɪkə/, U.S. /ˈmaɪkə/ Forms: 1600s– mica, 1700s–1800s micae (plural, in sense 1). Origin: A borrowing from Latin. Etymon: Latin mīca. Etymology: < classical Latin mīca grain, crumb, particle; further etymology uncertain: perhaps related to ancient Greek μικρός (see micro- comb. form). Compare post-classical Latin mica little spark (1579 in a British source).The use in mineralogy was probably originally contextual in the classical Latin sense, although already in quot. 1681 at sense 1 (following Wormius 1655) the word seems to have been erroneously associated with micāre to glitter or shine (see micant adj.). Mineralogy. †1. A small glistening particle of talc, selenite, or other crystalline substance present in large numbers in the structure of a rock. Also: a rock or stone containing such particles. Obsolete.Some quots. for micae may be referring to particles of mica in sense 2. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > texture or colour > [noun] > texture > having embedded crystals > crystalline substance in mica1681 kernel1839 phenocryst1889 idioblast1920 porphyroblast1920 porphyroclast1932 poikiloblast1944 1681 N. Grew Musæum Regalis Societatis iii. 320 Yellow Great-Glist. Ammochrysos, Boetio. So call'd, for that it consists of a great number of glossy sparks almost of the colour of Gold, immersed in a gritty Bed. And by Wormius and others therefore called Mica. 1684 Philos. Trans. (Royal Soc.) 14 745 Sand..with Mica of..Silver like, Gold like [particles]. a1728 J. Woodward Attempt Nat. Hist. Fossils Eng. (1729) i. viii. 170 A pale brown Earth, with very small Micæ in it. 1748 J. Hill Gen. Nat. Hist. I. 556 Dr. Woodward imagin'd the white parts of this as of the other Micæ in general to be Spar. 1776 W. Hamilton Campi Phlegræi II. Pl. xxxxviii (caption) A blackish stone with a shining black mica therein, which pulverizes at the least touch. 1803 H. J. Sarrett New Picture London 114 A great variety of Micæ or spangle stones. 2. Any of a group of monoclinic minerals which are composed of hydrous aluminosilicates of sodium, potassium, magnesium, etc., and occur as minute glittering plates or scales in granite and other rocks, and as crystals with perfect basal cleavage that are readily separable into thin, transparent, heat-resistant, usually flexible laminae (which can be used as a substitute for glass, and for thermal and electrical insulation, etc.).pearl, potash-, water mica: see the first element. ΘΚΠ society > occupation and work > materials > derived or manufactured material > glass and glass-like materials > [noun] > glass-like materials specular stone1577 murra1598 talc1601 isinglass1750 mica1778 Muscovy glass1794 muscovite1850 Vitreosil1909 vitreous silica1925 windolite1927 the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > mica glass-stone1601 ice-glass1664 daze1671 glimmer1683 isinglass1750 isinglass-stone1751 marienglas1762 mica1778 sheep's silver1814 1778 Philos. Trans. (Royal Soc.) 69 29 Mica or Glimmer. This..is composed of very thin flexible flakes, more or less large. 1811 J. Farey Gen. View Agric. Derbyshire I. 178 They abound with minute plates of Mica, called Silver, Spangles, &c. 1835 Rec. Gen. Sci. 2 445 Pinchbeck mica, iron pyrites, and titaniate of iron occur as accidental constituents. 1860 J. Tyndall Glaciers of Alps 3 Mica is a crystal which cleaves very readily in one direction. 1889 Harper's Mag. Aug. 400/2 He..painted them [sc. Chinese fans] with gods, with extraordinary birds, and with rare animals; varnished them and covered them with transparent sheets of mica. 1924 A. J. Allmand & H. J. T. Ellingham Princ. Appl. Electrochem. (ed. 2) xxvi. 667 The carbon electrodes..enter through suitable plates and stuffing-boxes, and are insulated with mica and asbestos. 1940 F. F. Grout Kemp's Handbk. Rocks (ed. 6) iii. 52 Biotite is much the commonest mica. 1971 Materials & Technol. II. 41 Micas are unaffected by fire, water, acids, and alkalis. 1999 Encycl. Brit. Online (Version 99.1) at Window Since early times, the openings [of windows] have been filled with..lights (panes) of glass or other translucent material such as mica. Compounds C1. General attributive. a. † mica battery n. Obsolete ΚΠ 1844 Philos. Trans. (Royal Soc.) 134 42 When a Leyden jar..was subjected to the action of one end of the battery, a charge was readily accumulated, and, of course, still more favourably by means of a mica battery. 1849 H. M. Noad Lect. Electr. (ed. 3) 148 The lacquered knob of the mica battery. mica goggles n. ΚΠ 1905 Daily Chron. 10 Aug. 5/6 A polo cap, mica goggles,..and the usual..allowance of lard constituted Burgess's costume. mica insulation n. ΚΠ 1891 Philos. Trans. 1890 (Royal Soc.) A. 181 137 I have made many other thermometers of this pattern with mica insulation. 1966 Proc. Royal Soc. 1965–6 A. 289 322 This [electron beam] monitor had a 1 mm thick aluminium front plate separated by thin mica insulation from a 1·5 mm thick brass back plate. mica plate n. ΚΠ 1837 D. Brewster Treat. Magnetism 312 The successive thicknesses of the mica plates. 1889 G. M. Hopkins Exper. Sci. xii. 267 Mica plates of suitable thickness are selected by trial in the instrument, and preserved for future use. 1988 Sci. News 30 Apr. 283 The instrument has a pair of curved mica plates that can be moved away from each other or towards each other. b. mica-packed adj. ΚΠ 1909 Westm. Gaz. 9 Mar. 4/3 A new three-point sparking-plug..which has no asbestos or mica-packed joints. mica-scaled adj. ΚΠ a1963 S. Plath Crossing Water (1971) 44 I shone, mica-scaled, and unfolded To pour myself out like a fluid. mica-topped adj. ΚΠ 1958 A. Wilson Middle Age of Mrs Eliot iii. 381 David banged his fist on the mica-topped table in front of him so that its little contemporary steel-tube legs rattled. C2. mica flap n. the flap of a mica valve. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > control(s) > [noun] > valve > parts of shank1660 seat1841 mica flap1906 spool1960 1906 J. W. Thomas Ventilation, Heating & Lighting of Dwellings ii. 27 There are many chimney ventilators on the market, some having mica flaps..to shut against a down current. 1986 E. Hall in A. Limon et al. Home Owner Man. (ed. 2) iii. ix. 439 A hinged mica flap is suspended inside the ventilator against this grille. † mica-powder n. Obsolete rare a form of dynamite in which fine scales of mica are used as the absorbent element. ΚΠ 1881 Trans. Amer. Inst. Mining Engineers 1880–1 9 131 Mica-powder, a No. 1 dynamite, in which the dope is fine scales of mica. mica-schist n. [after French micaschiste (1807); compare earlier mica-slate n.] Geology a foliated, crystalline, metamorphic rock composed of alternate layers of mica and quartz and easily split. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > other metamorphics quartzite1823 mica-schist1826 amphibolite1833 hornfels1854 phthanite1854 hornblendite1874 psammite1882 tourmaline-rock1882 tourmaline-schist1882 jasperoid1898 skarn1901 metagabbro1904 metabasite1907 verdite1908 rodingite1911 siallite1933 tonstein1961 greenlandite1981 1824 H. T. De la Beche tr. Sel. Geol. Mem. in Ann. des Mines Pref. p. x Micaschiste. (Mica Slate.) Essentially composed of an abundance of continuous mica and quartz. The structure slaty.] 1826 R. Mills Statistics S. Carolina 30 Mica-schiste. Talco-Mica Schiste. 1833 C. Lyell Princ. Geol. III. 237 The sterile mica-schist is barely covered with vegetation. 1876 Amer. Naturalist 10 386 The rocks in which the valley is formed are, for the most part, clay slates and gold-bearing mica schists, which are very much curved and twisted. 1939 A. G. Tansley Brit. Islands & their Vegetation viii. xxxix. 799 On the Scottish mountains the arctic-alpine chomophyte communities reach their greatest development in the corries of the mica-schists. 1988 P. Wayburn Adventuring in Alaska (rev. ed.) i. 11 Alaska's most ancient rocks are mica-schists that date back only six-hundred million years. mica-slate n. [after French micaschiste (1807)] Geology (now rare) = mica-schist n. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > schist > varieties of hammochrysos1706 hornslate1791 hornblende slate1794 horn porphyry1794 horn-schist1799 mica-slate1809 green schist1817 hornblende schist1821 kinzigite1878 phyllite1878 spilosite1882 mylonite1885 1809 Trans. Amer. Philos. Soc. 6 ii. 412 Primitive Rocks. 1. Granite, 2. Gneiss, 3. Mica slate, [etc.]. 1877 R. W. Raymond Statistics Mines & Mining 229 A large number of fine lodes, all occurring in limestone and mica-slate. 1923 Jrnl. Ecol. 11 263 Across Adolf Bay is the De Geer Range, composed chiefly of Archaean gneiss and mica-slate. mica valve n. an air valve consisting of a flap of mica hinged at the top, used esp. in ventilator ducts and shafts. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > control(s) > [noun] > valve > others washer1596 turncock1702 air cock1709 Jack-in-the-box1728 runner1754 stop-valve1829 three-way cock1838 ball valve1839 relief valve1846 poppet valve1851 plunger valve1854 pot-lid1856 reflux valve1857 screw-down1864 mica valve1880 tide flap1884 tube-valve1884 swing-tap1892 relay valve1894 Schrader1895 pilot valve1900 mixer valve1904 spool valve1908 spill valve1922 safety valving1930 three-way1939 1880 S. S. Hellyer Plumber (ed. 2) xxii. 262 When no convenient place can be found for leaving the mouth of the induct-pipe open to the atmosphere, a mica-valve can be fixed over it. 1909 G. B. Shaw in Trans. Medico-Legal Soc. 6 217 One day on the Health Committee a question came up with regard to a mica valve not being in order. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online June 2022). < n.1681
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