igneous
Granite
Phaneritic plutonic rock (composed primarily of Quartz, Feldspar, and Mica)
Hardness: 6-7 Mohs; Color: Mottled tan, orange, gray, and black; Luster: Dull to vitreous; Texture: Phaneritic (coarse-grained); Composition: High silica content.
- Hardness
- 6-7 Mohs
- Color
- Mottled tan, orange, gray, and black
- Luster
- Dull to vitreous
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Physical properties
Hardness: 6-7 Mohs; Color: Mottled tan, orange, gray, and black; Luster: Dull to vitreous; Texture: Phaneritic (coarse-grained); Composition: High silica content.
Formation & geological history
Formed from the slow crystallization of magma below Earth's surface. It is a plutonic intrusive rock typically associated with continental crust formation over millions of years.
Uses & applications
Extensively used in construction for countertops, floor tiles, paving stones, curbing, and monuments due to its durability and aesthetic appeal.
Geological facts
Granite is one of the hardest and most common rocks in the Earth's crust. The red/orange tint in this specimen is likely due to potassium feldspar or iron oxide staining.
Field identification & locations
Identified by its visible interlocking crystals of different colors. It is commonly found in mountainous regions or riverbeds as weathered pebbles. Collectors can find it almost anywhere in continental shield areas.
