igneous
Weathered granitic rock
Granite, likely biotite-bearing; quartz, feldspar, and mica
AI-generated identification · may be incorrectCoarse-grained, pinkish-tan and gray with dark mica patches, vitreous to earthy luster, and irregular fracture; typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75. Individual quartz and feldspar crystals may be visible, with no consistent cleavage at the specimen scale.
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Physical properties
Coarse-grained, pinkish-tan and gray with dark mica patches, vitreous to earthy luster, and irregular fracture; typical hardness is about 6–7 Mohs and specific gravity 2.63–2.75. Individual quartz and feldspar crystals may be visible, with no consistent cleavage at the specimen scale.
Formation & geological history
Forms when silica-rich magma slowly crystallizes deep within the continental crust; the exact geological age cannot be determined from the image and may range from Precambrian to Mesozoic or younger. Surface weathering has likely altered the exposed feldspar and iron-bearing minerals.
Uses & applications
Commonly used as dimension stone, countertops, building stone, aggregate, monuments, and landscaping material; ordinary hand specimens have little commercial or collector value.
Geological facts
Granite’s interlocking crystals give it high durability, while weathering commonly produces rusty brown iron-oxide staining and granular disintegration.
Field identification & locations
Common worldwide, especially in continental mountain belts and exposed batholiths; identify by visible quartz, pale feldspar, and dark mica in a coarse interlocking texture. A hand lens and fresh broken surface are more reliable than the weathered exterior.
