Are the minerals that make lenses and magnifying lenses quartz or white?
A mineral consisting of silica or translucent or opaque crystals; usually milky and tough in textureQuartz is a kind of physical and chemical properties of mineral resources are very stable, the crystal belongs to the three party system of oxide minerals, namely low quartz (a- quartz), is the most widely distributed in the minerals of quartz minerals. A generalized quartz also includes high temperature quartz (b- quartz). Also known as silica quartz block that is the production of quartz sand (also called silica) raw material is quartz refractory material and firing ferrosilicon materials.
Crystal chemical formula SiO2, the main components of natural quartz quartz, often contain a small amount of impurities such as Al2O3, IMO, CaO, MgO and so on. It has a variety of types. The daily used ceramic materials are quartz, quartz sand, quartzite, sandstone, silica, opal, diatomite, rice shell ash SiO2. is also rich in quartz appearance are usually white, milky white, pale translucent state, Mohs hardness of 7, off the mask glass luster or fat luster, because the proportion of crystal varies, changes between 2.22-2.65. With the ordinary sand, crystal is a kind of material with out of the womb ". When the time is perfect crystalline silica crystal; silica gel after dehydration is agate; solidification colloidal silica water; silica grain is less than a few microns, on the formation of chalcedony, chert, secondary quartzite.
Quartz sand is a hard, wear-resistant, stable chemical properties of silicate minerals, its main mineral composition is SiO2, quartz sand color is milky white or colorless and translucent, 7 hardness, brittle cleavage, conchatus fracture, oil sheen, relative density is 2.65, the chemical, thermal and mechanical properties have obvious the anisotropy, insoluble in acid, slightly soluble in KOH solution, the melting point of 1750 DEG C.According to the quality of quartz can be divided into ordinary quartz sand, fine quartz sand, high purity quartz sand, quartz sand. Quartz sand is an important industrial mineral raw material, widely used in glass, casting, ceramics and refractories, metallurgy, construction, chemical, plastic, rubber, abrasive and other industries.
Quartz mineral is one of the most widely distributed of the earth's surface, its use is quite extensive. As far as the stone age, people making stone axes, arrow and simple production tools use it to hunt for food and fight against the enemies. Quartz clock, electronic equipment in the piezoelectric quartz plate is used as the standard frequency; after melting made of glass. Can be used for the production of optical instruments, glasses, glass and other products; also can do precision instrument bearings, grinding materials, glass ceramics and other industrial raw materials.
The quartz is non plastic materials, the porcelain with higher clay formation at high temperature and the mullite crystal mechanical strength and chemical stability, and can increase the translucent body, is a good material for the preparation of white glaze.The period of the Republic of China by King Sambo Peng produced after the founding of new China quartz, Xingzi, Duchang, most of the province, quartz, especially after 2000, the sharp increase in the amount of glaze in the amount of 10%. 30%, wash before use should be chosen to remove dirt, impurities in kiln high temperature calcination, easy to crush.A colorless, transparent quartz variants, the Greeks called "Krystallos", meaning "white ice", they are sure that quartz is durable and solid ice. Chinese ancient people think that mouth cold crystal can quench thirst.
