mineral

Milky quartz-rich rock, possibly quartz vein material

Quartz (SiO₂), likely massive or druzy quartz with iron-oxide staining

AI-generated identification · may be incorrect

White to cream, translucent, vitreous-to-waxy luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The gray-brown areas may be iron/manganese oxides or attached matrix, but the image cannot confirm exact composition.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled fractures in older host rock, later weathering to expose the specimen. Such quartz veins occur from Precambrian to modern geological settings.

Uses & applications

Quartz is used in glass, ceramics, electronics, abrasives, and engineered stone; attractive pieces are sold as cabinet or lapidary specimens. This rough specimen does not appear jewelry grade.

Geological facts

Quartz is one of Earth’s most abundant minerals and is identified by its hardness and conchoidal fracture. The cream coloration commonly results from fluid inclusions or iron staining.

Field identification & locations

Common in hydrothermal veins worldwide, including Brazil, Madagascar, the United States, and many mining districts. Scratch a glass surface cautiously to test hardness; avoid confusing it with calcite, which is much softer and reacts with acid.