igneous
Likely quartz-bearing granite or pegmatite fragment
Granite/pegmatite, chiefly quartz (SiO₂) with feldspar and possibly mica
AI-generated identification · may be incorrectLight gray-white, coarse crystalline, mostly vitreous to dull luster; quartz hardness 7, feldspar about 6, no consistent cleavage in quartz, and typical specific gravity around 2.6–2.7. The image is insufficient for confident mineral identification.
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Physical properties
Light gray-white, coarse crystalline, mostly vitreous to dull luster; quartz hardness 7, feldspar about 6, no consistent cleavage in quartz, and typical specific gravity around 2.6–2.7. The image is insufficient for confident mineral identification.
Formation & geological history
An igneous rock formed by slow cooling of silica-rich magma underground; pegmatitic varieties crystallize in late-stage fluids and can be geologically young to Precambrian depending on locality.
Uses & applications
Granite is used for construction, countertops, monuments, and aggregate; attractive pieces may be polished as décor or collected, though this fragment appears ordinary.
Geological facts
Visible pale, interlocking grains and possible darker mica are consistent with granite or pegmatite, but similar appearance can occur in quartz-rich metamorphic rocks.
Field identification & locations
Look for distinct glassy quartz, blocky feldspar cleavage, and flaky mica; a hardness test, streak, acid test, and close examination are needed to distinguish granite from quartzite or a mineral vein. Common worldwide in continental crust and pegmatite districts.
