mineral

Quartz-bearing gray rock, likely druzy quartz in host rock

Quartz (SiO₂), possibly in a chert, chalcedony, or fine-grained volcanic host

AI-generated identification · may be incorrect

White to gray translucent crystals with vitreous to sugary luster; quartz hardness Mohs 7, no cleavage, conchoidal fracture, and specific gravity about 2.65. The dark matrix appears fine-grained and may contain iron or manganese staining.

Identified August 16, 2026More mineral →

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At a glance

Common name: Quartz-bearing gray rock, likely druzy quartz in host rock
Scientific name: Quartz (SiO₂), possibly in a chert, chalcedony, or fine-grained volcanic host
Category: mineral
Identified: August 16, 2026
Method: Standard

AI Estimated Value

Typically $2–$15 for a small common rough specimen; approximately $15–$50 if the druzy crystals are unusually attractive or locality-documented.

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 fluids filled cavities or fractures and deposited quartz crystals; the host rock may be volcanic or sedimentary. Exact geological age and locality cannot be determined from the image.

Uses & applications

Primarily a study or collector specimen; attractive pieces may be used in lapidary work, décor, or jewelry, though this rough fragment is not typically high-value.

Geological facts

The sparkling surface is probably druzy quartz, consisting of many tiny interlocking crystals rather than one large crystal. Quartz commonly forms in geodes, veins, cavities, and hydrothermal deposits.

Field identification & locations

Look for glassy sparkle, hardness sufficient to scratch ordinary glass, and lack of cleavage; a steel knife should not scratch quartz. Common worldwide in quartz veins, geodes, volcanic rocks, and hydrothermal deposits.