Feb 6, 2009

Chert

Synonyms: flint
Chemical composition: SiO2 
Characteristics: Pillar of a pulp for the amorphous and crystalline silicate is a mixture of quality, color black, brown black. Appearance for tuberculosis, plates, layered, translucent, surface often has a white capsule of silicate, tuberculosis often containing organic compounds, waxy luster, hardness 6.5 to 7, the proportion of 2.60 ~ 3.65. Containing silicon (Si) of about 46.7%, oxygen (O) 53.3%, chemical stability, are soluble in hydrogen fluoride, but not soluble in other acids, more soluble in caustic alkali quartz. 
Occurrence: occurrence of fissures in the limestone or thin shape of tuffaceous sediments, by siliceous replacement solution formed. Luan Shan belong to Miocene are sometimes found in Cretaceous layer, the habitat for the sea animal fossils materials, often containing the remains of diatoms, when mixed with calcium carbonate and organic matter. 
Uses: glass, ball mill grinding of the body; paints, fertilizers, pesticides, rubber and other additives, asphalt roads of steelmaking slag making use of filling materials.

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