Granite
What is Granite?
Granite is a coarse-grained igneous rock composed primarily of quartz, feldspar, and mica. It is a common and widely occurring type of intrusive, felsic igneous rock. Granite is typically massive, hard, and durable, making it suitable for construction and decorative purposes.
Optical Properties
- Refractive Index
- 1.544-1.563
- Birefringence
- Low
- Pleochroism
- Weak to absent
- Optical Character
- Biaxial
- Dispersion
- Low
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Granite before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Granite Localities Map
See where Granite is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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Quick Facts
Physical Properties
- Color
- Typically white, pink, or gray, with dark mineral grains
- Hardness (Mohs)
- 6-7
- Density
- 2.65 - 2.75 g/cm³
- Streak
- White to gray
Chemical Properties
- Chemical Formula
- Complex silicate
- Elements
- Silicon, Oxygen, Aluminum, Potassium, Sodium, Calcium, Iron
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Granite FAQs
How do I identify Granite?
Granite can be identified by its hardness of 6-7 on the Mohs scale, Typically white color. Look for these key characteristics when examining specimens.
What color is Granite?
Granite typically appears in Typically white, pink, or gray, with dark mineral grains. Color can vary depending on impurities and formation conditions.
How hard is Granite?
Granite has a hardness of 6-7 on the Mohs scale. This gives it moderate hardness.