mineral

Polished smoky quartz crystal point

Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions

AI-generated identification · may be incorrect

Mohs hardness 7; translucent gray-brown to cream, vitreous luster, hexagonal crystal structure, conchoidal fracture, no cleavage, specific gravity about 2.65. The specimen is cut and polished into a six-sided point, with cloudy internal veils and brown staining or inclusions.

Identified August 31, 2026More mineral →

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Physical properties

Formation & geological history

Quartz forms from silica-rich hydrothermal fluids in cavities and veins, commonly in igneous and metamorphic rocks; smoky coloration results mainly from irradiation affecting aluminum-related defects. Individual crystals may form over millions of years, with no specific age determinable from the image.

Uses & applications

Used for ornamental carvings, crystal collecting, lapidary objects, and occasionally jewelry; quartz is also important industrially in glass, electronics, and abrasives.

Geological facts

Quartz is one of Earth’s most abundant minerals and has piezoelectric properties. The visible point shape is human-made rather than a natural crystal termination.

Field identification & locations

Identify by its glassy luster, hardness, hexagonal geometry, and inability to scratch with a steel knife; it should scratch ordinary glass. Common sources include Brazil, Madagascar, the United States, and the Alps.