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TOPAZ


Chemical Composition: Fluorosilicate of aluminium with hydroxyl, Al 2 (F,OH) 2 SiO 4
Refractive Index: 1.61 – 1.64
Specific Gravity: 3.5 – 3.6
Crystal System: Orthorhombic
Moh's Hardness: 8
Topaz occurs in a variety of colours from pink, orange, yellow, brown, blue
colourless. The most common locality for Topaz is Brazil although there are
other sources including Japan, Madagascar, Burma, Pakistan, USA
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