mineral

Tumbled smoky quartz, possibly morion

Quartz (silicon dioxide, SiO₂), likely radiation-darkened smoky quartz

AI-generated identification · may be incorrect

Mohs hardness 7; translucent brown to nearly black with vitreous luster and conchoidal fracture. Hexagonal crystal structure, though tumbling has removed crystal faces; no cleavage, specific gravity about 2.65.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Forms in silica-rich hydrothermal veins, granitic pegmatites, and cavities; dark color results from aluminum impurities altered by natural radiation. Quartz is geologically ancient and occurs in rocks of nearly all ages.

Uses & applications

Used as a lapidary stone, ornamental material, and inexpensive jewelry or cabochons; attractive tumbled pieces are mainly collector items.

Geological facts

The dark variety is called morion when nearly opaque black; internal color zoning and rounded edges indicate tumbling or polishing rather than a natural crystal.

Field identification & locations

Identify by its glassy luster, hardness, lack of cleavage, and conchoidal chips; it commonly occurs in Brazil, Madagascar, the Alps, and the United States. The image could also represent dark quartz-rich slag or coated material, so testing is advisable.