mineral

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite (recrystallized quartz sandstone)

AI-generated identification · may be incorrect

White to pale gray, massive and opaque-to-translucent with a vitreous-to-waxy luster and irregular fracture; visible grains are poorly resolved. Quartz hardness is Mohs 7, with no cleavage and specific gravity about 2.65.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Could be a quartz vein fragment or quartzite formed by metamorphism of sandstone. Such material is common in Precambrian terrains and sedimentary basins; the photograph cannot establish geological age.

Uses & applications

Common quartz is used for glass, ceramics, abrasives, engineered stone, and industrial silica. This small specimen has little commercial or jewelry value unless unusually clear or attractive.

Geological facts

The angular shape and pale color are consistent with weathered vein quartz, but surface coating or alteration may obscure the texture.

Field identification & locations

Near 17.9°S, 51.7°W in Goiás, Brazil, quartz veins and quartz-rich rocks are geologically plausible. Test for hardness by seeing whether it scratches glass; a steel knife should not scratch it. A vinegar test is irrelevant because quartz does not react.