igneous
Granite
Granite (Felsic Intrusive Igneous Rock)
Hardness: 6-7 Mohs; Color: White with black/dark green specks (biotite/amphibole); Luster: Dull/Granular (weathered); Crystal: Phaneritic (coarse-grained)
- Hardness
- 6-7 Mohs
- Color
- White with black/dark green specks (biotite/amphibole)
- Luster
- Dull/Granular (weathered)
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Physical properties
Hardness: 6-7 Mohs; Color: White with black/dark green specks (biotite/amphibole); Luster: Dull/Granular (weathered); Crystal: Phaneritic (coarse-grained)
Formation & geological history
Formed through the slow crystallization of magma below the Earth's surface in batholiths. This specimen is a rounded river stone worn down by water erosion over long periods.
Uses & applications
Construction (countertops, tiles), monuments, aggregate in road building, and as a durable material for stone carving.
Geological facts
Granite makes up much of the Earth's continental crust. The distinct 'salt and pepper' look comes from the mixture of quartz, feldspar, and darker minerals like mica.
Field identification & locations
Identify in the field by its interlocking visible crystals and lack of layering. Found globally in mountainous regions or as river-transported pebbles.
