feldspathoidn.

Brit.

/ˈfɛl(d)spəθɔɪd/, U.S.

/ˌfɛl(d)ˈspæˌθɔɪd/

Forms: Also felspathoid.

Etymology: < fel(d)spath (see feldspar n.) + -oid suffix.

Mineralogy.

Any of a group of minerals chemically similar to the feldspars, but containing less silica.

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspathoid

feldspathoid1896

1896 J. F. Kemp Handbk. Rocks i. 6 (heading) Feldspathoids. With the feldspars are placed two other important and closely related minerals, nepheline and leucite.

1896 J. F. Kemp Handbk. Rocks i. 6 The feldspars, together with the feldspathoids nepheline and leucite, are the most important of the rock-making minerals in their relations to the classification of rocks.

1910 Bull. Geol. Soc. Amer. 21 87 Monzonite may not be rich in alkalies nor carry any feldspathoid.

1912 W. Cross et al. in Jrnl. Geol. (Chicago) 20 561 We suggest the term felsic for the group of modal feldspars, feldspathoids, and quartz.

1959 C. S. Hurlbut Dana's Man. Mineral. (ed. 17) 500 The feldspathoids are chemically similar to the feldspars, in that they are aluminosilicates of chiefly potassium, sodium, and calcium but with minor amounts of other ions.

Derivatives

ˌfeldspaˈthoidal adj. (also ˌfelspaˈthoidal)

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > tectosilicate > [adjective] > feldspathoid

feldspathoidal1930

1930 Geol. Mag. LXVII. 416 The hypothesis of the origin of felspathoidal rocks by reaction between magma and limestone.

1968 Mineral. Abstr. XIX. 234 Carbonate-rich feldspathoidal rocks from Nsala vent.

This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022).

单词	feldspathoid
释义	feldspathoidn. Brit. /ˈfɛl(d)spəθɔɪd/, U.S. /ˌfɛl(d)ˈspæˌθɔɪd/ Forms: Also felspathoid. Etymology: < fel(d)spath (see feldspar n.) + -oid suffix. Mineralogy. Any of a group of minerals chemically similar to the feldspars, but containing less silica. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspathoid feldspathoid1896 1896 J. F. Kemp Handbk. Rocks i. 6 (heading) Feldspathoids. With the feldspars are placed two other important and closely related minerals, nepheline and leucite. 1896 J. F. Kemp Handbk. Rocks i. 6 The feldspars, together with the feldspathoids nepheline and leucite, are the most important of the rock-making minerals in their relations to the classification of rocks. 1910 Bull. Geol. Soc. Amer. 21 87 Monzonite may not be rich in alkalies nor carry any feldspathoid. 1912 W. Cross et al. in Jrnl. Geol. (Chicago) 20 561 We suggest the term felsic for the group of modal feldspars, feldspathoids, and quartz. 1959 C. S. Hurlbut Dana's Man. Mineral. (ed. 17) 500 The feldspathoids are chemically similar to the feldspars, in that they are aluminosilicates of chiefly potassium, sodium, and calcium but with minor amounts of other ions. Derivatives ˌfeldspaˈthoidal adj. (also ˌfelspaˈthoidal) ΘΚΠ the world > the earth > minerals > types of mineral > silicates > tectosilicate > [adjective] > feldspathoid feldspathoidal1930 1930 Geol. Mag. LXVII. 416 The hypothesis of the origin of felspathoidal rocks by reaction between magma and limestone. 1968 Mineral. Abstr. XIX. 234 Carbonate-rich feldspathoidal rocks from Nsala vent. This entry has not yet been fully updated (first published 1972; most recently modified version published online March 2022). < n.1896
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