igneous
Quartz-rich granite
Granite, composed chiefly of quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pale pink and cream with visible interlocking crystals; quartz has Mohs hardness 7, feldspar 6, and mica about 2–3. Typically vitreous quartz and feldspar luster, with no regular cleavage across the rock.
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Physical properties
Coarse-grained, pale pink and cream with visible interlocking crystals; quartz has Mohs hardness 7, feldspar 6, and mica about 2–3. Typically vitreous quartz and feldspar luster, with no regular cleavage across the rock.
Formation & geological history
Slow cooling and crystallization of silica-rich magma deep in the crust produced the coarse texture. Granite forms in continental crust over geologic timescales, commonly hundreds of millions to billions of years ago.
Uses & applications
Used as building and paving stone, countertops, monuments, and decorative aggregate; this rough specimen is mainly suitable for collecting.
Geological facts
The image shows a hand-sized, weathered, quartz- and feldspar-rich rock; its exact mineral proportions and granite subtype cannot be confirmed from a photo.
Field identification & locations
Look for interlocking, visible crystals and a mixture of light quartz/feldspar with darker minerals; granite is widespread in continental mountain belts and exposed plutons. A field hardness or fresh-surface inspection can help distinguish it from similar rocks.
