Clear Quartz
Blue Topaz
Topaz Al2(SiO4)(F,OH)2 is a precious gemstone with a hardness of 8 on the Mohs Scale. It comes in many colours Colourless, white, pale blue, light green, yellow, yellowish brown, or red. The bright blues so popular in jewellery are nearly always heat treated. It has a specific gravity of 3.4 – 3.6 and forms according to a Orthorhombic crystal system.
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