snowflake obsidian
Obsidian which has radial crystal clusters composed of cristobalite on its surface.
simple past tense and past participle of displenish
plural of first world problem
plural of substem
地質学者は表面にクリストバライトの放射状結晶クラスターが見られ、雪の結晶のような模様をした黒曜石を注意深く観察した。
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