igneous
Granite
Granite
Hardness: 6-7 (Mohs), Color: Pink (orthoclase feldspar), grey (quartz), and black (biotite/hornblende), Luster: Vitreous to dull, Crystal Structure: Phaneritic (coarse-grained, visible crystals), Specific Gravity: 2.63 - 2.75
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Physical properties
Hardness: 6-7 (Mohs), Color: Pink (orthoclase feldspar), grey (quartz), and black (biotite/hornblende), Luster: Vitreous to dull, Crystal Structure: Phaneritic (coarse-grained, visible crystals), Specific Gravity: 2.63 - 2.75
Formation & geological history
Formed by the slow crystallization of magma below Earth's surface (intrusive igneous). It can range from Precambrian to Cenozoic eras and is primarily found in continental crust or mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as crushed stone for road base.
Geological facts
Granite is one of the hardest and most common rocks on Earth's continental crust. The pink color in this specific specimen indicates a high concentration of potassium-rich feldspar.
Field identification & locations
Identify in the field by its speckled appearance and 'salt and pepper' look with visible, interlocking crystals. Common in mountainous regions and tectonic plate boundaries. Use a hand lens to see mineral cleavage in feldspar.
