igneous
Quartz-rich granitic rock, possibly pegmatite
Quartz–feldspar aggregate; likely granite or granitic pegmatite
AI-generated identification · may be incorrectHardness about 6–7 Mohs; pale tan to white, granular texture, and vitreous to dull luster. Visible interlocking quartz and feldspar grains; cleavage may occur in feldspar, while quartz lacks cleavage.
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Physical properties
Hardness about 6–7 Mohs; pale tan to white, granular texture, and vitreous to dull luster. Visible interlocking quartz and feldspar grains; cleavage may occur in feldspar, while quartz lacks cleavage.
Formation & geological history
Formed by slow cooling of silica-rich magma, likely in a continental crustal intrusion; commonly Precambrian to Phanerozoic in age. The image alone cannot establish a precise age or locality.
Uses & applications
Used as crushed stone, building and ornamental material; attractive coarse-grained pieces may be collected, though this specimen appears low-grade commercially.
Geological facts
The yellowish sparkle may reflect iron-stained feldspar, mica, or weathering rather than gold. A density, streak, acid, and hardness test would help distinguish granite from quartz-rich vein material.
Field identification & locations
Common in continental mountain belts and exposed plutons worldwide. Identify by its coarse interlocking grains; quartz scratches glass, whereas feldspar shows flat cleavage surfaces.
