igneous
Likely rough feldspar-bearing granite or pegmatite fragment
Granite/pegmatite; chiefly quartz (SiO₂), feldspar, and minor mica
AI-generated identification · may be incorrectSmall pale cream-green, coarse crystalline fragment with a vitreous to dull luster and irregular fracture; estimated Mohs hardness 6–7, with feldspar cleavage and quartz lacking cleavage. Exact identification is limited by the image and could include weathered quartz or a feldspar-rich mineral.
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Physical properties
Small pale cream-green, coarse crystalline fragment with a vitreous to dull luster and irregular fracture; estimated Mohs hardness 6–7, with feldspar cleavage and quartz lacking cleavage. Exact identification is limited by the image and could include weathered quartz or a feldspar-rich mineral.
Formation & geological history
Likely formed by slow cooling of silica-rich magma, producing interlocking crystals; pegmatites crystallize late and may be geologically young relative to surrounding plutonic rocks, commonly Precambrian to Mesozoic depending on locality.
Uses & applications
Granite is used for aggregate, paving, countertops, and monuments; attractive feldspar or quartz pieces may be collected, but this specimen appears too small and weathered for jewelry.
Geological facts
The pale, blocky grains suggest feldspar, while translucent areas may be quartz. A glass-scratch test, streak, cleavage examination, and magnification would substantially improve identification.
Field identification & locations
Common in continental crust, granite outcrops, stream gravels, and pegmatite zones worldwide. Look for visible interlocking grains, feldspar cleavage, and quartz that scratches glass but does not show cleavage.
