pyrochroiten.

Brit.

/ˌpʌɪrə(ʊ)ˈkrəʊʌɪt/, U.S.

/ˌpaɪrəˈkroʊˌaɪt/

Origin: A borrowing from German. Etymon: German Pyrochroit.

Etymology: < German Pyrochroit (L. J. Igelström 1864, in Ann. der Physik u. Chemie 122 182) < pyro- pyro- comb. form + ancient Greek χροιά colour ( < the base of ancient Greek χρώς colour ( < the same base as χρῶμα colour: see chrome n.) + -ιά , suffix forming concrete nouns) + German -it -ite suffix¹, so called because it becomes coloured when heated. Compare earlier dichroite n., phoenicochroite n., etc.

Mineralogy.

A manganese-containing mineral which occurs in hydrothermal vein deposits, often as pale greenish or bluish crystals in foliated masses which darken on exposure.Pyrochroite is manganese( ii) hydroxide, Mn(OH)₂; the manganese analogue of brucite. Crystal system: trigonal.

ΘΚΠ

the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > hydroxides > others

gibbsite1822

pyrochroite1868

portlandite1933

hydrocalumite1934

nordstrandite1962

wickmanite1967

tetrawickmanite1973

1868 J. D. Dana Syst. Mineral. (ed. 5) 177 Pyrochroite... Occurs in veins, 1 to 2 lines broad.

1888 Amer. Naturalist 22 350 The anhydrous manganese hydroxide pyrochroite (Mn(OH)₂) has been obtained..in little hexagonal prisms, perfectly transparent, of a light red tint, and with a negative refractive index.

1968 Amer. Mineralogist 53 733 The basic manganese arsenates..usually occur in close association and have crystallized late with calcite, pyrochroite and barite.

1999 Proc. National Acad. Sci. U.S.A. 96 3453/1 The crystal structure of pyrochroite..consists of stacked sheets of Mn(II)(OH)₆ octahedra.

This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022).

单词	pyrochroite
释义	pyrochroiten. Brit. /ˌpʌɪrə(ʊ)ˈkrəʊʌɪt/, U.S. /ˌpaɪrəˈkroʊˌaɪt/ Origin: A borrowing from German. Etymon: German Pyrochroit. Etymology: < German Pyrochroit (L. J. Igelström 1864, in Ann. der Physik u. Chemie 122 182) < pyro- pyro- comb. form + ancient Greek χροιά colour ( < the base of ancient Greek χρώς colour ( < the same base as χρῶμα colour: see chrome n.) + -ιά , suffix forming concrete nouns) + German -it -ite suffix¹, so called because it becomes coloured when heated. Compare earlier dichroite n., phoenicochroite n., etc. Mineralogy. A manganese-containing mineral which occurs in hydrothermal vein deposits, often as pale greenish or bluish crystals in foliated masses which darken on exposure.Pyrochroite is manganese( ii) hydroxide, Mn(OH)₂; the manganese analogue of brucite. Crystal system: trigonal. ΘΚΠ the world > the earth > minerals > types of mineral > oxides and hydroxides > [noun] > hydroxides > others gibbsite1822 pyrochroite1868 portlandite1933 hydrocalumite1934 nordstrandite1962 wickmanite1967 tetrawickmanite1973 1868 J. D. Dana Syst. Mineral. (ed. 5) 177 Pyrochroite... Occurs in veins, 1 to 2 lines broad. 1888 Amer. Naturalist 22 350 The anhydrous manganese hydroxide pyrochroite (Mn(OH)₂) has been obtained..in little hexagonal prisms, perfectly transparent, of a light red tint, and with a negative refractive index. 1968 Amer. Mineralogist 53 733 The basic manganese arsenates..usually occur in close association and have crystallized late with calcite, pyrochroite and barite. 1999 Proc. National Acad. Sci. U.S.A. 96 3453/1 The crystal structure of pyrochroite..consists of stacked sheets of Mn(II)(OH)₆ octahedra. This entry has been updated (OED Third Edition, December 2007; most recently modified version published online March 2022). < n.1868
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