igneous
Granite
Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica
AI-generated identification · may be incorrectLight gray, speckled with dark minerals; interlocking crystalline texture and no foliation. Typical Mohs hardness is about 6–7; mineral grains have varied cleavage and luster.
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Physical properties
Light gray, speckled with dark minerals; interlocking crystalline texture and no foliation. Typical Mohs hardness is about 6–7; mineral grains have varied cleavage and luster.
Formation & geological history
Forms when silica-rich magma cools slowly beneath Earth’s surface, allowing visible crystals to grow. Granite bodies occur across many geological ages and continental settings.
Uses & applications
Widely used as building and paving stone, countertops, monuments, and decorative aggregate; this small rough piece is mainly suitable for collecting.
Geological facts
The pale grains are likely quartz and feldspar, while dark flecks are commonly biotite or hornblende; a photo cannot confirm exact mineral proportions.
Field identification & locations
Identify by its hard, interlocking grains and mixed light-and-dark speckling; it is common in continental crust worldwide. The rounded shape suggests natural weathering or transport.
