igneous
Tumbled quartz-rich rock, likely milky quartz with brown iron staining
Quartz (SiO₂), possibly in a weathered quartz-bearing rock; exact host rock cannot be determined from the photo
AI-generated identification · may be incorrectOpaque white quartz patches in a brown, rounded, polished surface; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no cleavage and conchoidal fracture. The brown color is likely iron-oxide staining.
Identified More igneous →
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Physical properties
Opaque white quartz patches in a brown, rounded, polished surface; quartz has Mohs hardness 7, vitreous luster, and a trigonal crystal structure, with no cleavage and conchoidal fracture. The brown color is likely iron-oxide staining.
Formation & geological history
Quartz forms in many geological settings, including cooling magma and mineral-rich hydrothermal fluids; iron staining develops during weathering. The specimen’s geological age and source cannot be identified from appearance alone.
Uses & applications
Mostly suited to collecting or display; quartz is widely used in glass, ceramics, electronics, and decorative stone.
Geological facts
Quartz is one of Earth’s most abundant minerals and commonly occurs as veins or as grains in other rocks.
Field identification & locations
Look for hardness near 7, glassy luster, and lack of cleavage; this appears to be a tumbled specimen, so natural surfaces are obscured. Quartz occurs worldwide.
