igneous
Granite
Intrusive Igneous Rock
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, white, grey, green) depending on feldspar content. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals). Specific gravity: 2.65 to 2.75.
- Hardness
- 6 on the Mohs scale
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6 on the Mohs scale. Color: Varies widely (pink, white, grey, green) depending on feldspar content. Luster: Vitreous to dull. Crystal structure: Phaneritic (coarse-grained, visible crystals). Specific gravity: 2.65 to 2.75.
Formation & geological history
Formed from the slow cooling and solidification of magma rich in silica and alkali metals deep beneath the Earth's surface, typically over millions of years.
Uses & applications
Widely used in construction, architectural building facades, monuments, countertops, paving, and decorative aggregate.
Geological facts
Granite is the most common rock of the Earth's continental crust and is frequently found in major mountain ranges. It is exceptionally durable and resistant to weathering.
Field identification & locations
Easily identified by its distinctive speckled appearance featuring interlocking crystals of quartz, feldspar, and mica. Commonly found in shield areas and mountainous regions worldwide. Collectors look for unique pegmatitic variations.
