igneous
Weathered granite or granitic pegmatite fragment
Felsic intrusive rock composed mainly of quartz, feldspar, and minor mica
AI-generated identification · may be incorrectCoarse, pale cream-to-gray granular texture with visible interlocking crystals; quartz has glassy luster, feldspar is commonly dull and may show cleavage, and mica may appear dark. Hardness is roughly 6–7 Mohs; no obvious layering or foliation is visible.
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Physical properties
Coarse, pale cream-to-gray granular texture with visible interlocking crystals; quartz has glassy luster, feldspar is commonly dull and may show cleavage, and mica may appear dark. Hardness is roughly 6–7 Mohs; no obvious layering or foliation is visible.
Formation & geological history
Formed by slow cooling of silica-rich magma deep in the crust, likely during Precambrian to younger continental plutonic activity; the rounded shape indicates abrasion or weathering after exposure.
Uses & applications
Used as aggregate, building stone, countertops, and decorative material; this small unpolished fragment has little commercial use.
Geological facts
Granite’s interlocking crystals give it high durability and resistance to abrasion. The specimen may also be a feldspar-rich pegmatitic variety if the pale crystals are unusually coarse.
Field identification & locations
Identify it by its speckled quartz–feldspar–mica appearance, hardness, and lack of reaction to dilute acid; common worldwide in continental mountain belts and glacial deposits. A photo alone cannot distinguish granite confidently from weathered quartz-rich metamorphic rock.
