ultramaficadj.n.

/ʌltrəˈmafɪk/

Etymology: < ultra- prefix 3 + mafic adj.

Geology.

Of an igneous rock: composed chiefly of mafic minerals. Also as n.

ΘΚΠ

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

fem1902

sal1902

ultramafic1933

ultrabasic1964

komatiite1969

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

basic1854

acid1859

ultrabasic1881

femic1902

sal1909

ultramafic1933

komatiitic1975

1933 R. A. Daly Igneous Rocks & Depths of Earth ii. 31 The more important groups [of igneous rocks] are the granite clan.., the ultramafic clans, and the ‘feldspathoidal’ clans.

1933 R. A. Daly Igneous Rocks & Depths of Earth xxii. 565 Each of the ultramafic and ultrabasic species..treated in this chapter has its own unsolved problems.

1948 Bull. Oregon State Dept. Geol. & Mineral. 39 8 The ultramafics include bodies of dunite, pyroxenite, and gabbro which have been extensively altered to hornblendite and serpentine.

1965 G. J. Williams Econ. Geol. N.Z. x. 143/1 The useful non-metallic minerals are more abundant in those ultramafics which have been subjected either to metamorphic or metasomatic changes.

1967 P. J. Wyllie Ultramafic & Related Rocks 1/1 Ultramafic monomineralic rocks composed of the following mafic minerals would certainly be ultrabasic..forsterite..fayalite..hornblende..biotite.

1971 I. G. Gass et al. Understanding Earth i. 23/1 Only in the ultramafic rocks..does Al₂O₃ fall to significantly lower values than those quoted.

This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).

单词	ultramafic
释义	ultramaficadj.n. /ʌltrəˈmafɪk/ Etymology: < ultra- prefix 3 + mafic adj. Geology. Of an igneous rock: composed chiefly of mafic minerals. Also as n. ΘΚΠ the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [noun] > mineral composition fem1902 sal1902 ultramafic1933 ultrabasic1964 komatiite1969 the world > the earth > structure of the earth > constituent materials > rock > igneous rock > [adjective] > mineral composition basic1854 acid1859 ultrabasic1881 femic1902 sal1909 ultramafic1933 komatiitic1975 1933 R. A. Daly Igneous Rocks & Depths of Earth ii. 31 The more important groups [of igneous rocks] are the granite clan.., the ultramafic clans, and the ‘feldspathoidal’ clans. 1933 R. A. Daly Igneous Rocks & Depths of Earth xxii. 565 Each of the ultramafic and ultrabasic species..treated in this chapter has its own unsolved problems. 1948 Bull. Oregon State Dept. Geol. & Mineral. 39 8 The ultramafics include bodies of dunite, pyroxenite, and gabbro which have been extensively altered to hornblendite and serpentine. 1965 G. J. Williams Econ. Geol. N.Z. x. 143/1 The useful non-metallic minerals are more abundant in those ultramafics which have been subjected either to metamorphic or metasomatic changes. 1967 P. J. Wyllie Ultramafic & Related Rocks 1/1 Ultramafic monomineralic rocks composed of the following mafic minerals would certainly be ultrabasic..forsterite..fayalite..hornblende..biotite. 1971 I. G. Gass et al. Understanding Earth i. 23/1 Only in the ultramafic rocks..does Al₂O₃ fall to significantly lower values than those quoted. This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018). < adj.n.1933
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