mineral
Quartz-rich rock, likely milky quartz with iron staining
Quartz (SiO₂), possibly a quartz vein fragment
AI-generated identification · may be incorrectPale gray to cream, rough and irregular, with a vitreous-to-dull luster and no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The small specimen’s appearance is consistent with quartz, but the image does not show diagnostic detail for a firm identification.
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Physical properties
Pale gray to cream, rough and irregular, with a vitreous-to-dull luster and no obvious cleavage; quartz has Mohs hardness 7 and a hexagonal crystal structure. The small specimen’s appearance is consistent with quartz, but the image does not show diagnostic detail for a firm identification.
Formation & geological history
Quartz commonly crystallizes from silica-rich hydrothermal fluids in fractures and veins, or forms during igneous and metamorphic processes. Its age cannot be determined from the image.
Uses & applications
Quartz is used in glassmaking, construction aggregates, electronics, and ornamental collecting; this rough fragment appears primarily of modest collector interest.
Geological facts
Quartz is one of Earth’s most abundant minerals and breaks with a curved, shell-like (conchoidal) fracture rather than along cleavage planes.
Field identification & locations
Look for hardness sufficient to scratch glass, lack of cleavage, and a glassy fracture; quartz occurs worldwide in veins, pegmatites, and many rock types. The specimen’s exact composition and locality are uncertain from the photograph.
