igneous
Quartz-rich granite (likely pegmatitic granite)
Granite, composed chiefly of quartz and feldspar with possible mica
AI-generated identification · may be incorrectCoarse-grained, pale gray-pink and mottled; visible quartz and feldspar crystals. Quartz has Mohs hardness 7 and vitreous luster; feldspar is about 6, with no obvious cleavage visible at this distance.
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Physical properties
Coarse-grained, pale gray-pink and mottled; visible quartz and feldspar crystals. Quartz has Mohs hardness 7 and vitreous luster; feldspar is about 6, with no obvious cleavage visible at this distance.
Formation & geological history
Intrusive magma cooled slowly underground, allowing large crystals to form; likely formed hundreds of millions to billions of years ago, though the image cannot establish its age.
Uses & applications
Granite is widely used as building and paving stone, aggregate, and decorative stone; this weathered loose specimen is mainly of modest collecting interest.
Geological facts
The rounded shape and softened edges suggest prolonged weathering or transport, while its coarse crystalline texture is typical of slowly cooled plutonic rock.
Field identification & locations
Look for interlocking pale feldspar, glassy gray quartz, and occasional dark mica grains. Granite occurs worldwide in continental crust; the photo alone cannot confirm exact identification or locality.
