igneous
Quartz-rich rock, possibly quartz vein material
Likely milky quartz with iron-stained or weathered host rock; exact identification is uncertain from the photo
AI-generated identification · may be incorrectMostly white to gray, with a glassy-to-dull luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The specimen appears rough and weathered, with darker inclusions or attached host material.
Identified More igneous →
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Physical properties
Mostly white to gray, with a glassy-to-dull luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, with no cleavage. The specimen appears rough and weathered, with darker inclusions or attached host material.
Formation & geological history
Quartz commonly forms when silica-rich fluids fill cracks and cool, or crystallizes in igneous and metamorphic settings; the specimen’s age and precise formation environment cannot be determined from appearance alone.
Uses & applications
Quartz is widely used in glassmaking, electronics, abrasives, and decorative stone; this small rough piece is mainly suitable for collecting.
Geological facts
Quartz is one of Earth’s most abundant minerals and can occur as veins cutting through many rock types.
Field identification & locations
Look for hardness sufficient to scratch glass, absence of cleavage, and a pale streak; quartz veins occur worldwide. A definitive identification would require testing the darker material and examining a fresh surface.
