igneous
Red granite (likely weathered granite or granitic gneiss)
Granite; chiefly quartz (SiO₂), feldspar, and biotite/amphibole
AI-generated identification · may be incorrectCoarse-grained, mottled burgundy-red and white, with a granular texture and dull to vitreous luster. Typical hardness is about 6–7 Mohs; crystals are interlocking and lack cleavage as a whole, though feldspar may cleave.
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Physical properties
Coarse-grained, mottled burgundy-red and white, with a granular texture and dull to vitreous luster. Typical hardness is about 6–7 Mohs; crystals are interlocking and lack cleavage as a whole, though feldspar may cleave.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep within Earth’s crust, generally during Precambrian to Phanerozoic plutonic events; surface weathering rounded this specimen.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and landscaping rock; attractive polished pieces are collected but usually have modest value.
Geological facts
The red color commonly comes from iron-oxide-stained potassium feldspar, while white areas are feldspar or quartz. A hand lens should reveal visible interlocking crystals rather than a glassy or uniformly fine-grained texture.
Field identification & locations
Common worldwide, especially in shield regions and large batholiths; notable sources include India, Brazil, Scandinavia, and the United States. It can be distinguished from brick or concrete by natural crystal boundaries and randomly distributed quartz/feldspar grains.
