igneous
Weathered granite or granitic gneiss fragment
Quartz–feldspar–mica aggregate; likely granite (possibly gneiss)
AI-generated identification · may be incorrectCoarse-grained, pale gray to pink rock with visible quartz, feldspar, and dark mica/ferromagnesian minerals; vitreous quartz luster, feldspar cleavage, Mohs hardness about 6–7, and no obvious layering discernible at this scale.
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Physical properties
Coarse-grained, pale gray to pink rock with visible quartz, feldspar, and dark mica/ferromagnesian minerals; vitreous quartz luster, feldspar cleavage, Mohs hardness about 6–7, and no obvious layering discernible at this scale.
Formation & geological history
Granite crystallizes slowly from silica-rich magma deep in continental crust, commonly during Precambrian to Mesozoic mountain-building; surface weathering produces the rusty iron staining visible here. If foliated, it may be metamorphic gneiss derived from granite.
Uses & applications
Used as crushed aggregate, dimension stone, paving, monuments, and building material; this small weathered fragment has negligible commercial or jewelry value.
Geological facts
Pink coloration commonly comes from potassium feldspar, while brown-red patches are iron-oxide weathering products. Granite is one of Earth’s most widespread continental rocks.
Field identification & locations
Identify it by interlocking visible grains of quartz and feldspar, with mica flakes and a hard, nonporous texture; a glassy streak or strong fizz would suggest something else. Common worldwide in continental shields and mountain belts.
