mineral

Quartz-rich rock, possibly druzy quartz on altered host rock

Quartz (SiO₂), likely with mica/clay minerals and minor iron-oxide staining

AI-generated identification · may be incorrect

Pale gray-green to off-white, rough granular texture, vitreous to dull luster, and irregular fracture; quartz hardness is 7 Mohs with no cleavage. The specimen appears porous and weathered, with small sparkling crystal surfaces and yellow-brown iron staining.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled cavities or fractures, depositing microcrystalline quartz; later weathering altered the host rock. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Common quartz specimens are collected decoratively; quartz is widely used in glass, ceramics, electronics, abrasives, and construction aggregate. This rough piece has little jewelry value unless crystals are clearer and more attractive.

Geological facts

The granular sparkle may represent druzy quartz, while the green-gray material could be altered volcanic rock, serpentine, or clay-rich matrix. A steel file should not scratch exposed quartz, though softer matrix may scratch easily.

Field identification & locations

Look for glassy crystal faces, conchoidal fracture, and resistance to scratching; a streak test and hardness test help distinguish quartz from calcite or soft coatings. Common in hydrothermal veins and cavities worldwide.