mineral
Weathered quartz-rich rock, likely milky quartz or quartzite
Quartz (SiO₂), possibly quartzite with iron-oxide staining
AI-generated identification · may be incorrectCream to honey-brown, opaque to translucent, with a dull-to-glassy luster and irregular fracture; quartz hardness is 7 Mohs, no cleavage, and specific gravity about 2.65. The brown coloration likely comes from hydrated iron oxides, while the rough texture suggests weathering or a quartzite matrix.
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Physical properties
Cream to honey-brown, opaque to translucent, with a dull-to-glassy luster and irregular fracture; quartz hardness is 7 Mohs, no cleavage, and specific gravity about 2.65. The brown coloration likely comes from hydrated iron oxides, while the rough texture suggests weathering or a quartzite matrix.
Formation & geological history
Quartz crystallizes from silica-rich fluids or magma; quartzite forms when sandstone is metamorphosed and its grains recrystallize. An exact geological age and origin cannot be determined from the photograph alone.
Uses & applications
Common quartz-rich material is used as aggregate, construction stone, abrasives, and silica feedstock; attractive pieces may be collected but are generally not gem quality.
Geological facts
Quartz is one of Earth’s most abundant minerals and is chemically resistant, so it commonly survives erosion as rounded stream or beach pebbles.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass, white streak, lack of cleavage, and glassy fracture; iron staining produces yellow, orange, or brown patches. Common worldwide, especially in quartz veins, metamorphic terrains, and sedimentary gravel deposits.
