igneous
Granite or granitic gneiss pebble
Felsic granitoid, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph
AI-generated identification · may be incorrectLight gray, coarse-grained, speckled texture with weak foliation or a vein; likely Mohs 6–7, vitreous to dull luster, massive to weakly banded, with poor cleavage as a whole. Individual feldspars show cleavage, while quartz does not.
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Physical properties
Light gray, coarse-grained, speckled texture with weak foliation or a vein; likely Mohs 6–7, vitreous to dull luster, massive to weakly banded, with poor cleavage as a whole. Individual feldspars show cleavage, while quartz does not.
Formation & geological history
Formed by slow crystallization of silica-rich magma deep in the continental crust, commonly during Precambrian to Phanerozoic mountain-building; the visible pale line may be a quartz or feldspar vein.
Uses & applications
Used as crushed aggregate, building stone, countertops, monuments, and landscaping material; this small specimen has mainly educational or modest collecting value.
Geological facts
Granite is recognized by visible interlocking quartz and feldspar grains, commonly with black or silvery mica. If foliation is genuine rather than surface texture, the specimen may be granitic gneiss, a metamorphic equivalent.
Field identification & locations
Common worldwide, especially in continental shield and mountain regions. Look for glassy gray quartz, white or pink feldspar, and dark mica; a hand lens and streak/acid tests help, though the image is insufficient for certainty.
