igneous
Granite with Quartz inclusion
Granite (Mainly SiO2, KAlSi3O8, NaAlSi3O8)
Hardness: 6-7 Mohs; Color: Greyish-white with pinkish or tan hues; Luster: Dull to vitreous where quartz is exposed; Crystal structure: Phaneritic (visible crystals); Cleavage: Indistinct; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 Mohs
- Color
- Greyish-white with pinkish or tan hues
- Luster
- Dull to vitreous where quartz is exposed
Identified More igneous →
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Physical properties
Hardness: 6-7 Mohs; Color: Greyish-white with pinkish or tan hues; Luster: Dull to vitreous where quartz is exposed; Crystal structure: Phaneritic (visible crystals); Cleavage: Indistinct; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the slow crystallization of magma below Earth's surface (intrusive). The exposed crystalline part is likely a quartz vein or large feldspar crystal within the granitic matrix.
Uses & applications
Used extensively in construction (countertops, tiles), as crushed stone for road base, and as decorative architectural stone.
Geological facts
Granite makes up much of the continental crust. It is one of the hardest commonly occurring rocks and can withstand thousands of years of weathering.
Field identification & locations
Identify in the field by its speckled 'salt and pepper' appearance and visible interlocking crystals. Common in mountainous regions or areas with glacial till.
