Usually crystalline or granular or massive aggregates. Pure is colorless and transparent, but mostly because of containing trace pigment ions or subdivision of loose color wrapped, or because of the color center and various colors, and reduce transparency. Vitreous luster fracture is often oily luster. Mohs hardness 7, specific gravity 2.65. Shell fracture. With piezoelectricity and optical rotation.
English name Quartzite silicon oxide mineral composition is SiO2. Mainly refers to widely distributed three party system of low temperature quartz alpha quartz. When the temperature is above 573 degrees Celsius, it becomes the high temperature quartz beta quartz of the six square system. A low temperature quartz crystal often having six pointed columns with pointed ends. There is a difference between a left crystal and a right one on the cylinder. Twinning is common, the most common for the Dauphine twin and Brazil twins
It's natural. If it is not natural, it should be called artificial quartz stone.
