igneous
Quartz-rich granite or granitic pegmatite fragment
Granite, chiefly quartz (SiO₂), feldspar, and minor mica/iron oxides
AI-generated identification · may be incorrectApproximate Mohs hardness 6–7; pale pink, white, and gray with a granular texture and vitreous-to-dull luster. Interlocking quartz and feldspar grains are visible, though the small rounded specimen limits certainty about cleavage and crystal size.
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Physical properties
Approximate Mohs hardness 6–7; pale pink, white, and gray with a granular texture and vitreous-to-dull luster. Interlocking quartz and feldspar grains are visible, though the small rounded specimen limits certainty about cleavage and crystal size.
Formation & geological history
Formed when silica-rich magma slowly cooled deep underground, producing coarse crystals; most granite formed during Precambrian to Phanerozoic continental crust formation. Its rounded edges suggest weathering, transport, or tumbling.
Uses & applications
Common granite is used as crushed stone, aggregate, dimension stone, countertops, and monuments; attractive pieces may be collected but are generally low value.
Geological facts
The pink coloration commonly comes from potassium feldspar, while translucent gray areas are quartz. Iron staining can add orange or reddish patches.
Field identification & locations
Identify it by its speckled, interlocking grains, lack of layering or fossils, and inability to scratch easily with a steel nail; quartz should scratch glass. Common worldwide, especially in continental shields and mountain belts.
