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.

晶系	Orthorhombic
鉱物分類	09 Silicates
モース硬度	8.0
比重	3.49-3.57
色	Colorless, yellow, blue, pink, orange
光沢	Vitreous
条痕色	Colorless
劈開	Perfect {001}
断口	Conchoidal to uneven
透明度	Transparent
結晶習性	Prismatic