mineral

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely a quartz-lined cavity in host rock

AI-generated identification · may be incorrect

Typically hardness 7 Mohs, white to colorless, vitreous to sparkling drusy luster, and trigonal crystal structure with no cleavage. The granular cavity lining and translucent crystals are characteristic of quartz, though the specimen may include carbonate or other host minerals.

Identified September 1, 2026More mineral →

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At a glance

Common name: Quartz geode or drusy quartz cluster
Scientific name: Quartz (silicon dioxide, SiO₂), likely a quartz-lined cavity in host rock
Category: mineral
Identified: September 1, 2026
Method: Standard

AI Estimated Value

Approximately $10–$50 for a common hand-sized specimen; $50–$150 or more if unusually large, exceptionally lustrous, or from a desirable 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

Forms when silica-rich groundwater fills cavities in volcanic rock, sediment, or hydrothermal veins; quartz crystals grow inward over long periods, commonly from the Cenozoic to older geologic ages. The exact age and host rock cannot be determined from the image.

Uses & applications

Used as a decorative specimen, lapidary material, and source of collectible crystal clusters; quartz is also important in glass, electronics, abrasives, and engineered stone. This piece is primarily a display specimen.

Geological facts

The sparkling surface is drusy quartz—many tiny crystals coating a cavity. Quartz is abundant worldwide and is piezoelectric, producing an electrical charge when mechanically stressed.

Field identification & locations

Identify by its glassy sparkle, hardness, lack of cleavage, and inability to be scratched by a steel knife; it should scratch glass. Common sources include Brazil, Uruguay, Morocco, Mexico, and the United States.