出典:Wiktionary
From Ancient Greek χλωρός (khlōrós, “green”) + ἄστρον (ástron, “star”) (in allusion to its appearance) + λίθος (líthos, “stone”).
chlorastrolite (countable かつ uncountable, 複数形 chlorastrolites)
出典:Wikipedia
出典:『Wikipedia』 (2011/06/10 21:53 UTC 版)
Chlorastrolite also known as Michigan Greenstone, is a green or bluish green stone. Chlorastrolite has finely radiated or stellate masses that have a "turtleback" pattern. The stellate masses tend to be chatoyant, meaning they have a changeable luster. This chatoyancy can be subtranslucent to opaque. Chlorastrolite is a variety of pumpellyite: Ca2(Mg,Fe)Al2(SiO4)(Si2O7)(OH)2·H2O. Chlorastrolite was once thought to be an impure variety of prehnite or thomsonite.