Obsidian is mineral-like, but not crystalline. It is dark in color like basalt. It consists mainly of SiO2 (silicon dioxide), usually 70% or more.
ə b s ɪ d iə n WORD_BOUNDARY ɪ z WORD_BOUNDARY m ɪ n ə ɹ ɹ ə l l aɪ k WORD_BOUNDARY b ʌ t WORD_BOUNDARY n ɑ t WORD_BOUNDARY k ɹ ɪ s t ʌ l aɪ n WORD_BOUNDARY ɪ t WORD_BOUNDARY ɪ z WORD_BOUNDARY d ɑ ɹ k WORD_BOUNDARY ɪ n WORD_BOUNDARY k ʌ l ə ɹ WORD_BOUNDARY l aɪ k WORD_BOUNDARY b ʌ z ɔ l t WORD_BOUNDARY ɪ t WORD_BOUNDARY k ə n s ɪ s t s WORD_BOUNDARY m eɪ n l i WORD_BOUNDARY ʌ v WORD_BOUNDARY s iː WORD_BOUNDARY oʊ WORD_BOUNDARY t uː WORD_BOUNDARY s ɪ l ɪ k ə n WORD_BOUNDARY d aɪ ɑ k s aɪ d WORD_BOUNDARY j uː ʒ uː ə l i WORD_BOUNDARY s ɛ v ə n t i WORD_BOUNDARY p ə ɹ s ɛ n t WORD_BOUNDARY ɔ ɹ WORD_BOUNDARY m ɔ ɹ WORD_BOUNDARY