mineral

Weathered quartz-rich rock, possibly sandstone or milky quartz

Primarily quartz (silicon dioxide, SiO₂); exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Pale tan to gray, granular and sparkly with a dull-to-glassy luster; quartz has Mohs hardness 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen appears irregular and weathered, with possible iron-oxide staining or a fine-grained rock matrix.

Identified August 24, 2026More mineral →

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At a glance

Common name: Weathered quartz-rich rock, possibly sandstone or milky quartz
Scientific name: Primarily quartz (silicon dioxide, SiO₂); exact identification is uncertain from the photograph
Category: mineral
Identified: August 24, 2026
Method: Standard

AI Estimated Value

Typically $0-$5 as an unprepared common fragment; potentially $5-$20 if confirmed as an attractive unusual specimen.

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 as quartz grains in sedimentary sandstone, or as a weathered fragment of quartz vein; age and geological setting cannot be determined visually. Quartz commonly crystallizes from silica-rich fluids or accumulates as erosion-resistant sediment.

Uses & applications

Common quartz-rich rock is used as aggregate, building stone, and silica feedstock; attractive pieces may be kept as inexpensive specimens. This fragment is probably worth little commercially.

Geological facts

Quartz is one of Earth’s most abundant minerals and is highly resistant to chemical and physical weathering. Sparkling surfaces may reflect tiny quartz grains rather than well-formed crystals.

Field identification & locations

Test with a steel knife: quartz should resist scratching; glass may scratch it, while quartz should not scratch easily. A vinegar test and close inspection for visible sand grains can help distinguish sandstone from massive quartz.