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
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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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