mineral

Likely smoky quartz-bearing rock or quartz crystal

Quartz, silicon dioxide (SiO₂), possibly smoky quartz with iron- or irradiation-related coloration

AI-generated identification · may be incorrect

Translucent brown-gray to honey color, vitreous luster, irregular to weak conchoidal fracture, and apparent crystalline faces; Mohs hardness 7, no cleavage, specific gravity about 2.65. The rough, granular appearance suggests quartz in a matrix rather than a clean single crystal.

Identified August 9, 2026More mineral →

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At a glance

Common name: Likely smoky quartz-bearing rock or quartz crystal
Scientific name: Quartz, silicon dioxide (SiO₂), possibly smoky quartz with iron- or irradiation-related coloration
Category: mineral
Identified: August 9, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common rough specimen; $30–$150+ if well-crystallized, translucent, 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

Quartz crystallizes from silica-rich hydrothermal fluids or late-stage igneous cavities; smoky coloration commonly develops from irradiation acting on trace aluminum. The specimen’s exact geological age and locality cannot be determined from the image.

Uses & applications

Quartz is used in glass, ceramics, abrasives, electronics, and optical components; attractive smoky quartz is cut for jewelry or kept as a mineral specimen.

Geological facts

Quartz is one of Earth’s most abundant minerals and has a trigonal crystal structure. Brown coloration can also result from iron staining or surface weathering, so confirmed identification may require hardness and streak tests.

Field identification & locations

Common localities include Brazil, Madagascar, the Alps, Colorado, and Arkansas. Test by scratching glass (quartz should scratch it) while avoiding damage; a close inspection may reveal hexagonal crystal faces.