igneous
Weathered granite fragment
Granite, predominantly quartz–feldspar–mica rock
AI-generated identification · may be incorrectCoarse-grained, speckled pale gray/cream and brown from weathering; quartz has Mohs hardness 7, feldspar 6, and mica 2–3. Typically vitreous quartz luster, blocky feldspar cleavage, and no consistent foliation; apparent granular texture is visible.
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Physical properties
Coarse-grained, speckled pale gray/cream and brown from weathering; quartz has Mohs hardness 7, feldspar 6, and mica 2–3. Typically vitreous quartz luster, blocky feldspar cleavage, and no consistent foliation; apparent granular texture is visible.
Formation & geological history
Intrusive igneous rock crystallized slowly from silica-rich magma, commonly during Precambrian to younger continental crust formation. The rusty surface reflects oxidation of iron-bearing minerals and exposure weathering.
Uses & applications
Used extensively as dimension stone, countertops, monuments, aggregate, and building material; this irregular specimen has little commercial value but may interest casual collectors.
Geological facts
Granite is a rock rather than a single mineral and commonly contains interlocking quartz, potassium feldspar, plagioclase, and biotite or amphibole.
Field identification & locations
Identify by its interlocking visible crystals, quartz gray translucency, feldspar, and dark mica; it is common in continental terrains worldwide. A firm steel scratch generally does not scratch quartz but may mark softer feldspar or weathered areas.
