mineral
Quartz crystal cluster
Quartz (SiO₂), likely iron-stained; exact variety uncertain
AI-generated identification · may be incorrectHardness 7 Mohs; translucent tan to smoky-brown crystals with vitreous luster and hexagonal prismatic form. Quartz has no cleavage and uneven to conchoidal fracture; iron-oxide staining may account for rusty areas.
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Physical properties
Hardness 7 Mohs; translucent tan to smoky-brown crystals with vitreous luster and hexagonal prismatic form. Quartz has no cleavage and uneven to conchoidal fracture; iron-oxide staining may account for rusty areas.
Formation & geological history
Quartz crystals grow as silica-rich fluids cool in fractures or cavities, often over long periods. The image alone does not establish the specimen’s age or locality.
Uses & applications
Commonly collected as a mineral specimen; quartz is also used in glassmaking, electronics, abrasives, and jewelry.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many colors; trace impurities and irradiation can alter its appearance.
Field identification & locations
Look for glassy luster, six-sided crystal forms, hardness sufficient to scratch glass, and absence of cleavage. This appears to be a natural, rough cluster, but locality cannot be determined visually.
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