mineral

Quartz-rich crystalline rock, likely drusy quartz on matrix

Quartz (SiO₂), possibly intergrown with calcite or feldspar matrix

AI-generated identification · may be incorrect

Colorless to gray, translucent-to-transparent granular crystals with a glassy luster; quartz hardness is 7 Mohs, lacks cleavage, and has hexagonal crystal structure. Exact identification is limited by the photograph; gray matrix minerals may be softer and show cleavage.

Identified August 15, 2026More mineral →

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At a glance

Common name: Quartz-rich crystalline rock, likely drusy quartz on matrix
Scientific name: Quartz (SiO₂), possibly intergrown with calcite or feldspar matrix
Category: mineral
Identified: August 15, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a common hand specimen; $50–$200+ if crystals are unusually bright, well-formed, or from a documented locality.

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 a cavity or fracture and deposited a coating of small quartz crystals, potentially during low-temperature vein formation. Geological age cannot be determined visually and depends on locality.

Uses & applications

Used mainly as a mineral specimen or lapidary material; quartz has broad industrial uses in glass, electronics, abrasives, and engineered stone. Fine drusy specimens may be used in jewelry and display.

Geological facts

The sparkling surface is characteristic of drusy quartz, an aggregate of many tiny crystals rather than one large crystal. Quartz commonly develops on amethyst, agate, limestone, and metallic-ore veins.

Field identification & locations

Identify with a glassy sparkle, hardness sufficient to scratch ordinary glass, and no reaction to dilute hydrochloric acid; acid fizz would suggest calcite instead. Common worldwide in hydrothermal veins and geodes.