mineral

Tumbled milky quartz (probable)

Quartz, SiO₂; likely massive/milky quartz

AI-generated identification · may be incorrect

White to translucent gray, vitreous to waxy luster, poorly visible crystal structure because it is massive and rounded by tumbling or water wear. Mohs hardness 7; no cleavage, conchoidal fracture; specific gravity about 2.65.

Identified September 14, 2026More mineral →

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At a glance

Common name: Tumbled milky quartz (probable)
Scientific name: Quartz, SiO₂; likely massive/milky quartz
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a common tumbled piece; roughly $20–$75 if exceptionally large, translucent, or attractively patterned. Exact identification is limited by the photograph; calcite or pale chalcedony are secondary possibilities.

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

Forms when silica-rich fluids fill fractures and cavities, commonly in hydrothermal veins and granitic or metamorphic rocks. Quartz is geologically widespread and may range from ancient Precambrian material to young vein deposits.

Uses & applications

Used as a silica source for glass, ceramics, and engineered stone; attractive pieces are sold as inexpensive décor or lapidary specimens. Typical value is low unless unusually clear, patterned, or associated with other minerals.

Geological facts

The cloudy appearance comes from microscopic fluid inclusions, fractures, or fine mineral impurities. The rounded shape and uniformly smooth surface strongly suggest natural stream abrasion or human tumbling.

Field identification & locations

The specimen near 31.7°N, 116.6°W is regionally plausible: quartz veins and quartz-bearing granitic/metamorphic rocks occur in Baja California. Confirm with a scratch test—quartz should scratch ordinary glass, while a steel knife should not scratch it; avoid damaging valuable specimens.