igneous
Granite
Intrusive Igneous Rock
Hardness: 6-7 on the Mohs scale. Color: Varies widely (pink, white, gray, black) depending on mineral makeup. Luster: Dull to glassy. Crystal structure: Phaneritic (coarse-grained, visible interlocking mineral crystals). Specific gravity: 2.65 - 2.75.
- Hardness
- 6-7 on the Mohs scale
- Luster
- Dull to glassy
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Physical properties
Hardness: 6-7 on the Mohs scale. Color: Varies widely (pink, white, gray, black) depending on mineral makeup. Luster: Dull to glassy. Crystal structure: Phaneritic (coarse-grained, visible interlocking mineral crystals). Specific gravity: 2.65 - 2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma rich in silica and alkali metal oxides beneath the Earth's surface. Can range in geological age from Precambrian to relatively recent volcanic epochs.
Uses & applications
Widely used in construction, dimension stone for buildings, monuments, paving, countertops, and interior tiles due to its durability.
Geological facts
Granite is the most common plutonic rock of the Earth's crust and forms the core of many major mountain ranges. It is extremely resistant to weathering.
Field identification & locations
Easily identified by its speckled appearance of interlocking quartz (translucent), feldspar (pink or white), and biotite/amphibole (black) grains. Found globally in continental shields and mountain roots.
