igneous
Weathered granite boulder
Granite, a coarse-grained felsic intrusive igneous rock
AI-generated identification · may be incorrectPale gray to tan, rough and granular, with visible quartz and feldspar and scattered dark minerals; typical hardness is about 6–7 Mohs. Its interlocking crystals have no preferred cleavage as a whole; exact mineral proportions cannot be confirmed from the image.
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Physical properties
Pale gray to tan, rough and granular, with visible quartz and feldspar and scattered dark minerals; typical hardness is about 6–7 Mohs. Its interlocking crystals have no preferred cleavage as a whole; exact mineral proportions cannot be confirmed from the image.
Formation & geological history
Magma cooled slowly beneath the surface, forming interlocking crystals; the boulder’s rounded, rough surface reflects prolonged weathering. Granite bodies formed throughout geologic time, so this specimen’s age cannot be determined visually.
Uses & applications
Granite is widely used as building and paving stone, crushed aggregate, and monuments; this unworked boulder has little commercial value.
Geological facts
Granite commonly contains quartz, potassium feldspar, plagioclase, and biotite or hornblende.
Field identification & locations
Identify it by its coarse, speckled texture and hard, interlocking grains; similar granite occurs worldwide, especially in continental crust and mountain regions. A fresh broken surface is more diagnostic than a weathered exterior.
