mineral

Milky quartz-bearing rock (likely quartz vein fragment)

Quartz, silicon dioxide (SiO₂), with probable iron-oxide staining and dark host-rock inclusions

AI-generated identification · may be incorrect

White to translucent quartz with vitreous-to-waxy luster, irregular fracture, and no obvious cleavage; Mohs hardness 7, specific gravity about 2.65. The brown-black material is likely limonite/goethite staining or attached altered host rock; crystal form is massive rather than well terminated.

Identified August 23, 2026More mineral →

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At a glance

Common name: Milky quartz-bearing rock (likely quartz vein fragment)
Scientific name: Quartz, silicon dioxide (SiO₂), with probable iron-oxide staining and dark host-rock inclusions
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

About $2–$15 as an ordinary hand specimen; potentially $20–$50 if the veining, translucency, or locality is unusually attractive.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled fractures in older rock, later weathering to expose the vein fragment. Exact age and host formation cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are collected or used decoratively. This specimen appears mainly of modest display value.

Geological facts

Quartz commonly shows conchoidal fracture and can scratch ordinary glass. Iron oxides often create yellow, orange, brown, or reddish coatings and inclusions.

Field identification & locations

Confirm by testing whether it scratches glass but not steel, and by checking for quartz’s lack of cleavage; a streak test should be white. Quartz veins occur worldwide, especially in granitic, metamorphic, and hydrothermal terrains.