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Classification of Granite

Updated:2013-01-04 17:16:57
Granite is a naturally occurring rock. Granite has a medium to coarse grained structure, which is a common name for all Igneous and Metamorphic Rocks commercially, but geologically “Granite” is a term only for acidic, plutonic Igneous Rock. They can be classified based on Geological and Commercial Value, broadly into three groups.
Genesis
A medium or fine-grained rock of Gneissic structure is available in various colors. Plagioclase, microcline and quartz are the vital minerals, while titanite, biotite, apatite, epidote, zircon and garnet are found in lesser quantities. Small amount of hematite, pyroxene and sericite are also present in this rock, which is of a granitic composition, contains numerous crystallites. Gneisses can be recognized by the wavy patterns or zig zag movements. Others in this category are Paradiso, Kashmir White, Red Multi Color, Madura Gold, Colombo Juprana, Imperial White, Lavender Blue, Tropical Green, etc.
Porphyry
Some individual crystals known as phenocrysts are bigger than the ground mass, in such cases the texture is known as porphyritic and the granite is called as porphyry. Porphyries are granites which have dominant Feldspar Crystal or Flowers. Tan Brown, Sapphire Blue, Crystal Yellow, Steel Grey, Ruby Red, Cats eye belong to this class.
Dyke
Dykes are the Black Granites, which commonly occurs as Dolerite Dykes. The black granites which form a Ring Dyke is a classic example of the Dyke. Other black granites or Dykes include Absolute Black in Warangal, Chamrajnagar and other places.
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