mineral
Quartz-rich rock, possibly milky quartz
Quartz (SiO₂); exact specimen identification is uncertain from the photograph
AI-generated identification · may be incorrectWhite to gray, opaque, with a dull to vitreous luster and irregular fracture; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The specimen’s blocky shape may be natural or cut, and cannot be confirmed from the image.
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Physical properties
White to gray, opaque, with a dull to vitreous luster and irregular fracture; quartz has Mohs hardness 7, trigonal crystal structure, and no cleavage. The specimen’s blocky shape may be natural or cut, and cannot be confirmed from the image.
Formation & geological history
Quartz commonly crystallizes from silica-rich fluids in veins and pegmatites, or occurs in many rock types; its age depends on its geological setting.
Uses & applications
Quartz is used in glassmaking, ceramics, electronics, and jewelry; attractive pieces are collected or shaped for decoration.
Geological facts
Quartz is one of Earth’s most abundant minerals and can occur as massive, non-crystalline-looking chunks as well as distinct crystals.
Field identification & locations
A scratch test against glass can help identify quartz, though it should be done only with permission; common sources include quartz veins worldwide. The image does not provide enough detail to determine a locality or more specific rock type.
