igneous
Weathered granitic rock, possibly pegmatitic granite
Granite; chiefly quartz, feldspar, and mica (SiO₂-rich crystalline rock)
AI-generated identification · may be incorrectCoarse, irregularly crystalline, pale gray to cream with brown weathering and dark mica-rich patches. Likely Mohs 6–7 overall, vitreous to dull luster, with poor cleavage as a rock but cleavage in feldspar and mica; specific gravity about 2.6–2.7.
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Physical properties
Coarse, irregularly crystalline, pale gray to cream with brown weathering and dark mica-rich patches. Likely Mohs 6–7 overall, vitreous to dull luster, with poor cleavage as a rock but cleavage in feldspar and mica; specific gravity about 2.6–2.7.
Formation & geological history
Formed by slow cooling of silica-rich magma deep underground, producing interlocking quartz and feldspar crystals; later uplift and weathering altered the surface. The image alone cannot establish its geological age.
Uses & applications
Commonly used as building stone, aggregate, paving, and monuments; attractive pieces may be collected, though this specimen has little commercial value.
Geological facts
The crumbly pale areas may represent weathered feldspar or a quartz-feldspar vein. Brown staining is likely iron-oxide weathering rather than the rock’s original color.
Field identification & locations
At approximately 12.0°N, 79.4°E, weathered granite and related crystalline rocks are geologically plausible in the southern Indian shield. Confirm with a hand lens: visible interlocking quartz, pink/white feldspar, and black mica support granite; a steel knife should not easily scratch fresh quartz.
