igneous
Weathered granite fragment
Granite, primarily quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, mottled brown-gray rock with a dull to faintly glassy luster; typical hardness is about 6–7 Mohs, with no obvious cleavage as a whole, though feldspar and mica may cleave. Exact mineral proportions are uncertain from the image.
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Physical properties
Coarse-grained, mottled brown-gray rock with a dull to faintly glassy luster; typical hardness is about 6–7 Mohs, with no obvious cleavage as a whole, though feldspar and mica may cleave. Exact mineral proportions are uncertain from the image.
Formation & geological history
An intrusive igneous rock formed when silica-rich magma cooled slowly underground, commonly during Precambrian to Phanerozoic continental crust formation; surface weathering produced its rounded, rough appearance.
Uses & applications
Used widely as dimension stone, countertops, monuments, paving, aggregate, and landscaping rock; this small weathered fragment has negligible jewelry value.
Geological facts
Granite’s visible grains reflect slow cooling, allowing crystals to grow; brown coloration may result from iron staining or weathered feldspar and mica.
Field identification & locations
Identify it by interlocking visible grains of light feldspar/quartz and dark mica, lack of layering, and inability to scratch it easily with a steel knife. Common worldwide, especially in continental mountain belts and exposed shields.
