Orbicular Granite
What is Orbicular Granite?
Orbicular granite is an uncommon igneous rock characterized by its distinctive spherical or ellipsoidal structures, known as orbs. These orbs are typically composed of concentric layers of different minerals, often feldspar and quartz, creating a visually striking appearance. The granite itself is usually a coarse-grained rock, and the orbs are embedded within this matrix. The formation of orbs is believed to be a result of complex magmatic processes, including diffusion, crystallization, and the presence of volatile components.
Optical Properties
- Refractive Index
- 1.544-1.563
- Birefringence
- Moderate
- 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 Orbicular 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.
Orbicular Granite Localities Map
See where Orbicular 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
- Variable, often gray, pink, or reddish with contrasting orb colors
- Hardness (Mohs)
- 6-7
- Density
- 2.65 - 2.75 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- SiO2, Al2O3, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8
- Elements
- Silicon, Oxygen, Aluminum, Potassium, Sodium, Calcium
Also Known As
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Orbicular Granite FAQs
How do I identify Orbicular Granite?
Orbicular Granite can be identified by its hardness of 6-7 on the Mohs scale, Variable color. Look for these key characteristics when examining specimens.
What color is Orbicular Granite?
Orbicular Granite typically appears in Variable, often gray, pink, or reddish with contrasting orb colors. Color can vary depending on impurities and formation conditions.
How hard is Orbicular Granite?
Orbicular Granite has a hardness of 6-7 on the Mohs scale. This gives it moderate hardness.