This Clear Topaz crystal specimen is a wonderful example of the Topaz crystals found in Pakistan. It is on a Calcite, Feldspar Mica matrix. The Topaz crystal is 18mm wide and 18mm tall. It has some internal structures and surfaces from its interrupted growth process. The specimen weighs over 27g. Topaz is a silicate mineral of Aluminium and Fluorine. Common Topaz in colourless, though trace element impurities can make it pale blue, golden brown to yellow orange. Topaz in the market may be fake or has been treated with heat, or radiation, to make the stone deep blue, reddish-orange, pale green, pink, or purple. Topaz is the hardest silicate and one of the hardest naturally occurring crystals. It has a low refractive index which means it will not shine as brightly as other cut gemstones.
