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Vitrophyre Vitrophyre is a volcanic rock with larger crystals (phenocrysts) embedded in a glassy groundmass.〔(【引用サイトリンク】title=Vitrophyre definition from the Dictionary of Geology ).〕 Volcanic rock is formed when molten rock (magma), which is produced by a volcano, has cooled and solidified (crystallized). Groundmass of rock is the fine-grained mass of material in which larger grains or crystals are embedded. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Vitrophyre」の詳細全文を読む
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