perthiten.

Brit.

/ˈpəːθʌɪt/, U.S.

/ˈpərˌθaɪt/

Origin: From a proper name, combined with an English element. Etymons: proper name Perth , -ite suffix¹.

Etymology: < Perth, the name of the town in Ontario, Canada, where it was first found (compare quot. 1843) + -ite suffix¹. Compare French perthite (1862 or earlier).

Geology.

A variety of alkali feldspar usually consisting of roughly parallel intergrowths of an exsolved sodium-rich phase (as albite) and a potassium-rich phase (as microcline).

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspar > mixed or intergrowth feldspars

jade1595

granitone1811

saussurite1811

aventurine feldspar1816

perthite1843

myrmekite1911

aventurine sunstone-

1843 T. Thomson in London, Edinb., & Dublin Philos. Mag. 22 189 The next mineral I have to notice I distinguish by the name of Perthite. It was sent me by Mr. Wilson, a surgeon in Perth, a township of Upper Canada.

1941 Proc. Prehistoric Soc. 7 65 The phenocrysts are of albite and perthite.

1990 C. Pellant Rocks, Minerals & Fossils 13 Muscovite mica is dominant over biotite and there is a mingling of potassium and sodium feldspar (perthite).

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perthite
释义	perthiten. Brit. /ˈpəːθʌɪt/, U.S. /ˈpərˌθaɪt/ Origin: From a proper name, combined with an English element. Etymons: proper name Perth , -ite suffix¹. Etymology: < Perth, the name of the town in Ontario, Canada, where it was first found (compare quot. 1843) + -ite suffix¹. Compare French perthite (1862 or earlier). Geology. A variety of alkali feldspar usually consisting of roughly parallel intergrowths of an exsolved sodium-rich phase (as albite) and a potassium-rich phase (as microcline). ΘΚΠ the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > feldspar > mixed or intergrowth feldspars jade1595 granitone1811 saussurite1811 aventurine feldspar1816 perthite1843 myrmekite1911 aventurine sunstone- 1843 T. Thomson in London, Edinb., & Dublin Philos. Mag. 22 189 The next mineral I have to notice I distinguish by the name of Perthite. It was sent me by Mr. Wilson, a surgeon in Perth, a township of Upper Canada. 1941 Proc. Prehistoric Soc. 7 65 The phenocrysts are of albite and perthite. 1990 C. Pellant Rocks, Minerals & Fossils 13 Muscovite mica is dominant over biotite and there is a mingling of potassium and sodium feldspar (perthite). This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1843
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