出典:Wiktionary
From Ancient Greek σανίς (sanís, “board”) + -ine.
sanidine (countable かつ uncountable, 複数形 sanidines)
出典:Wikipedia
出典:『Wikipedia』 (2011/04/18 07:12 UTC 版)
Sanidine is the high temperature form of potassium feldspar (K,Na)(Si,Al)4O8. Sanidine most typically occurs in felsic volcanic rocks such as obsidian, rhyolite and trachyte. Sanidine crystallizes in the monoclinic crystal system. Orthoclase is a monoclinic polymorph stable at lower temperatures. At yet lower temperatures, microcline, a triclinic polymorph of potassium feldspar, is stable.