How many years would it take for dolomite and quartz to crystallize Cheng Yushi?
Quartzite is generally massive structure, granular structure, also contains a small amount of feldspar, sericite, amphibole and pyroxene, a variety of color, high hardness, can be used as building materials or railway track laying stone. Solid colored particles, fine, can be used as carving materials crafts
Quartz is one of silicon oxide species, its chemical composition is mainly SiO, the three party system. Translucent or opaque crystal; containing impurities in different colors, colorless and transparent crystal called crystal, Ru Shiying white, pale red called Rose Quartz, Amethyst purple or purple gem said Britain, Tan said the smoky quartz, Citrine, green and black is called the emerald, smoky quartz. Pure quartz can make a certain wavelength range of ultraviolet, visible light and infrared light through, optically active, piezoelectric and electrostrictive properties.The complete production in the rock crystal quartz geode, massive ore veins produced in the heat, granular is an important part of granite, gneiss and sandstone and other rocks.The number more than 2 is the continental crust of quartz ore, after feldspar, hard texture, is the main component of granite. Is a variant of the only stable under normal temperature and pressure SiO ten natural isomers.Quartz has many varieties, which change through the earth's crust and form a small amount of precious stones. Especially in Europe and the Middle East, quartz has been widely used for jewelry and hard stone carving since ancient times.
The main mineral is quartz, generally light or white, dense and hard, but the particles often form dense clumps, which are not easily distinguished by the naked eye.
A metamorphic rock with a quartz content greater than 85%, usually formed by recrystallization of sandstone or other siliceous rocks through regional metamorphism, contact metamorphism, or gas-liquid metamorphism.
