Question:
Kilap: Nonmetallic (vitreous) Kristal: Monoclinic Kekerasan: 2,5-3 Belahan: Cleavage satu arah Warna: Cokelat Karakteristik: Warna gelap Streak: Putih keabuan Kelompok: Silikat
Author: Ardian AnnafiAnswer:
Biotite
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Alternative answers:
Biotite mica