mineral
Polished smoky quartz crystal point
Quartz (SiO₂), likely iron-colored or smoky quartz with milky inclusions
AI-generated identification · may be incorrectMohs 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.
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Physical properties
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.
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.
