What is an optical property of some crystals which exhibit a star- shaped by reflected light, as star sapphire, or by transmitted light, as some mica called?
asterism — (Crystallog.) An optical property of some crystals which exhibit a star- shaped by reflected light, as star sapphire, or by transmitted light, as some mica. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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