igneous
Granite
Phaneritic Felsic Igneous Rock
Hardness: 6-7 (Mohs scale); Color: Salt and pepper appearance with pink, white, gray, and black speckles; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
- Hardness
- 6-7 (Mohs scale)
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Salt and pepper appearance with pink, white, gray, and black speckles; Luster: Vitreous to pearly; Crystal structure: Phaneritic (coarse-grained); Specific gravity: 2.63 to 2.75
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). It is found in continental crust and often dates back to various Eons, typically forming the cores of mountain ranges.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, monuments, and as a dimension stone for buildings.
Geological facts
Granite is the most common igneous rock found at Earth's surface. It is composed primarily of quartz, feldspar, and mica. The pink coloration comes from Potassium Feldspar, while white is Plagioclase Feldspar.
Field identification & locations
Identify in the field by its visible interlocking crystals of quartz and feldspar; it will not show layering like sediment. It is found in mountainous regions or glacial deposits. Collectors value unique color variations.
