igneous
Greenish-gray quartz-rich rock, possibly weathered granite or quartzite
Provisional identification: quartz–feldspar aggregate; exact species cannot be confirmed from one photograph
AI-generated identification · may be incorrectCoarse, irregular gray-green specimen with translucent white-gray grains and dull earthy luster; likely hardness about 6–7, with no obvious cleavage. The texture may represent interlocking quartz and feldspar, possibly with dark mica or chlorite.
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Physical properties
Coarse, irregular gray-green specimen with translucent white-gray grains and dull earthy luster; likely hardness about 6–7, with no obvious cleavage. The texture may represent interlocking quartz and feldspar, possibly with dark mica or chlorite.
Formation & geological history
If granite, it crystallized slowly from magma deep underground; if quartzite, it formed by metamorphic recrystallization of sandstone. A geological age cannot be determined visually and depends on its locality.
Uses & applications
Common granite is used for crushed stone, aggregate, building stone, and monuments; quartzite is used for construction, countertops, and decorative stone. This small rough piece has limited commercial value.
Geological facts
The image does not show diagnostic crystal faces or layering, so a confident species-level identification is not possible. A fresh broken surface, streak, hardness, and acid test would help distinguish granite from quartzite or other green metamorphic rocks.
Field identification & locations
Look for visible feldspar, quartz, and mica in granite; quartzite is usually more uniformly granular and fractures through quartz grains. Common worldwide; estimated value is $1–$10 for an ordinary hand specimen, or $10–$30 if locality-labeled and attractive.
