femicadj.

Brit.

/ˈfɛmɪk/, U.S.

/ˈfɛmɪk/

Origin: Formed within English, by derivation. Etymons: ferro- comb. form, magnesian adj.², -ic suffix.

Etymology: < fe- (in ferro- comb. form) + m- (in magnesian adj.²) + -ic suffix: see quot. 1902. Compare fem n.²

Geology.

Designating a primary category of igneous rocks whose chemical composition can be expressed in terms of a group of standard minerals which are relatively rich in iron and magnesium and poor in aluminium and silicon; of or relating to such rocks and their associated minerals. Contrasted with salic. Cf. fem n.²The classification was devised by the American geologists W. Cross, J. P. Iddings, L. V. Pirsson, and H. S. Washington.

ΘΚΠ

the world > the earth > minerals > types of mineral > [adjective] > other general types

allothigenic1888

femic1902

the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > mineral composition

basic1854

acid1859

ultrabasic1881

femic1902

sal1909

ultramafic1933

komatiitic1975

1902 W. Cross et al. in Jrnl. Geol. (Chicago) 10 573 To express concisely the two groups of standard minerals and their chemical characters in part, the words sal and fem have been adopted... Fem indicates Group II, since its minerals are dominantly ferromagnesian. As adjectives to express these ideas the words salic and femic will be used.

1909 J. P. Iddings Igneous Rocks I. ii. iii. 403 The method of calculation of the standard minerals from the chemical analysis of the rock is based on certain chemico-mineralogical relations affecting the salic and femic minerals with respect to the relative affinities of the base-forming elements for silicic acid.

1932 F. F. Grout Petrogr. & Petrol. ii. 46 The terms ‘salic’ and ‘femic’ refer to calculated molecules, not actual minerals, and should be used only in connection with chemical composition.

1966 Mineral. Abstr. 17 704 The problems of the determination of the amounts of femic minerals are discussed.

2004 Irish Jrnl. Earth Sci. 22 23/1 Ubiquitous rounded quartz crystals in the interphase layer are rimmed with fine-grained femic minerals.

This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022).

单词	femic
释义	femicadj. Brit. /ˈfɛmɪk/, U.S. /ˈfɛmɪk/ Origin: Formed within English, by derivation. Etymons: ferro- comb. form, magnesian adj.², -ic suffix. Etymology: < fe- (in ferro- comb. form) + m- (in magnesian adj.²) + -ic suffix: see quot. 1902. Compare fem n.² Geology. Designating a primary category of igneous rocks whose chemical composition can be expressed in terms of a group of standard minerals which are relatively rich in iron and magnesium and poor in aluminium and silicon; of or relating to such rocks and their associated minerals. Contrasted with salic. Cf. fem n.²The classification was devised by the American geologists W. Cross, J. P. Iddings, L. V. Pirsson, and H. S. Washington. ΘΚΠ the world > the earth > minerals > types of mineral > [adjective] > other general types allothigenic1888 femic1902 the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > mineral composition basic1854 acid1859 ultrabasic1881 femic1902 sal1909 ultramafic1933 komatiitic1975 1902 W. Cross et al. in Jrnl. Geol. (Chicago) 10 573 To express concisely the two groups of standard minerals and their chemical characters in part, the words sal and fem have been adopted... Fem indicates Group II, since its minerals are dominantly ferromagnesian. As adjectives to express these ideas the words salic and femic will be used. 1909 J. P. Iddings Igneous Rocks I. ii. iii. 403 The method of calculation of the standard minerals from the chemical analysis of the rock is based on certain chemico-mineralogical relations affecting the salic and femic minerals with respect to the relative affinities of the base-forming elements for silicic acid. 1932 F. F. Grout Petrogr. & Petrol. ii. 46 The terms ‘salic’ and ‘femic’ refer to calculated molecules, not actual minerals, and should be used only in connection with chemical composition. 1966 Mineral. Abstr. 17 704 The problems of the determination of the amounts of femic minerals are discussed. 2004 Irish Jrnl. Earth Sci. 22 23/1 Ubiquitous rounded quartz crystals in the interphase layer are rimmed with fine-grained femic minerals. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022). < adj.1902
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