Quartz Lumps

Quartz is the most abundant and most common mineral on the Earth. It is found in almost every geological environment and also it is at least a component of almost every rock type. It has a hexagonal crystal structure and is made of trigonal crystallized silica. It is most varied in terms of varieties, colors and forms.
The most important distinction between the types of quartz is that one is of macrocrystalline, which is individual crystal visible to the unaided eye, and the other is microcrystalline or cryptodrystalline varieties, aggregates of crysstals visible only under high magnification. Chalcedony is the generic term for cryptocrystalline quartz. The transparent variety tends to be macrocrystalline and the cryptocrystalline varieties are either translucent or mostly opaque.

Physical Properties of Quartz

1 Color Clear (in pure form)
2 Crystal habit 6-sided prism ending in 6 sided pyramid (typical)
3 Crystal System Trygonal
4 Cleavage None
5 Fracture Conchoidal
6 Mohs scale hardness 7- lower in impure varieties
7 Luster Vitreous
8 Refractive Index 1.544-1.533-Dr + 0.009 ( B-G interval )
9 Streak White
10 Specific Gravity 2.65 Constant, variable in impure varities
11 Melting point 1650 (±75)oC
12 Boling point 2230oC
13 Solubility H2O insoluble


  • Cruisibles
  • Solar Panels
  • Optical Fiber
  • Semi Conductors
  • Ceramics
  • Rubber
  • Glass Industry
  • Fiber Glass Industries
  • Glass(Bottling Plant)
  • Float Glass
  • Insulator(Porcelain)
  • Sanitary ware, Ceramic Tiles
  • Silicon Carbide, Abrasives
  • Refractory, Paint
  • Flits, Glaze
  • Television Picture Tube
  • Electronic Industries