出典:Wiktionary
出典:『Wiktionary』 (2026/03/05 22:52 UTC 版)
spherulite (plural spherulites)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/08 18:54 UTC 版)
Spherulites (
/ˈsfɛrʊˌlaɪt/), in petrology, are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone and rhyolite as globules about the size of millet seed or rice grain, with a duller luster than the surrounding glassy base of the rock, and when they are examined with a lens they prove to have a radiate fibrous structure.