Topaz

Al₂SiO₄(F,OH)₂

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Topaz is the reference mineral for hardness 8 on the Mohs scale. It forms in granite and pegmatite veins and is prized as a gemstone. Imperial topaz (orange-pink) from Ouro Preto, Brazil, is the most valuable variety.

결정계	Orthorhombic
광물 분류	09 Silicates
모스 경도	8.0
비중	3.49-3.57
색상	Colorless, yellow, blue, pink, orange
광택	Vitreous
조흔색	Colorless
벽개	Perfect {001}
단구	Conchoidal to uneven
투명도	Transparent
결정 습성	Prismatic