Quartz Information:....

Quartz, second most common of all minerals, is composed of silicon dioxide, or silica, Silica, SiO2 And distributed all over the world as a constituent of rocks and in the form of pure deposits. It is an essential constituent of igneous rocks such as granite, hyalite and pegmatite, which contain an excess of silica. Quartz is also the primary constituent of sand. The size of the crystals varies from specimens weighing a metric ton to minute particles that sparkle in rock surfaces. The minerals have a hardness of 7 on Moh scale and specific gravity of 2.65. The lustre in some specimens is vitreous; in others it is greasy or resplendent (shining glossily). Some specimens are transparent, glassy, and glazy; others are translucent. In the pure form, the minerals are colourless, but it is commonly colours by impurities.