mineral

Smoky quartz crystal cluster

Quartz, silicon dioxide (SiO₂), likely iron- or radiation-colored smoky quartz

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent brown to gray with vitreous luster, hexagonal crystal structure, and poor cleavage (conchoidal fracture). The specimen appears partly coated or included with darker matrix material.

Identified September 16, 2026More mineral →

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At a glance

Common name: Smoky quartz crystal cluster
Scientific name: Quartz, silicon dioxide (SiO₂), likely iron- or radiation-colored smoky quartz
Category: mineral
Identified: September 16, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a small, ordinary cluster; $50–$200+ if crystals are exceptionally transparent, sharply formed, 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

Formed when silica-rich hydrothermal fluids or late-stage magma crystallized in cavities and fractures, commonly in granite or pegmatite. Its exact geological age cannot be determined from the photograph.

Uses & applications

Used as a collector specimen and occasionally in jewelry; quartz is also important in glassmaking, electronics, abrasives, and engineered stone.

Geological facts

Smoky coloration commonly results from irradiation affecting aluminum impurities in quartz. Crystal faces and conchoidal fractures help distinguish it from brown glass or calcite.

Field identification & locations

Identify by its glassy luster, hardness, six-sided crystal habit, and inability to scratch it with a steel knife; common sources include Brazil, the United States, Switzerland, and Madagascar.