Useful: Granite
Granite is an igneous rock. It is formed as a result of the slow crystallisation of molten magma at depth in the earth's crust. Uplift and erosion has over millions of years resulted in this material outcropping at the surface. The minerals which make up granite are generally quartz, felspars and various mafic minerals (amphiboles, pyroxenes, micas and secondary materials). It is the size, distribution and precise chemistry of these minerals which give the granite it's colour. The silica content of granite should be at least 70%. In the stone industry "granite" has been a term applied to almost all igneous rocks and schists. |
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