mineral

Likely milky quartz-bearing rock

Quartz, silicon dioxide (SiO₂), possibly in a quartz-rich vein or sugary quartzite

AI-generated identification · may be incorrect

White to translucent, vitreous-to-sugary luster, irregular fracture, and no obvious cleavage; quartz hardness is Mohs 7 and specific gravity about 2.65. The rough, granular texture suggests interlocking quartz crystals, though the image cannot confirm the exact rock type.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids precipitated quartz in a fracture, or when quartz-rich sediment was metamorphosed; such material ranges from Precambrian to recent hydrothermal settings. Commonly associated with feldspar, mica, or iron staining.

Uses & applications

Used as silica feedstock for glass, ceramics, engineered stone, and abrasives; attractive pieces may be sold as specimens, though this fragment appears modestly collectible.

Geological facts

Quartz is one of Earth’s most abundant minerals and commonly forms veins cutting through older rocks. Milky opacity is caused mainly by microscopic fluid inclusions and structural defects.

Field identification & locations

Common in quartz veins, granite pegmatites, metamorphic rocks, and stream gravels worldwide; it should scratch ordinary glass but not be scratched by a steel knife. A vinegar test is uninformative because quartz does not effervesce.