mineral
Smoky quartz crystal cluster
Quartz (SiO₂), smoky variety
AI-generated identification · may be incorrectLikely a dark smoky quartz crystal with a pale quartz matrix; vitreous luster and prismatic, striated faces. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.
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Physical properties
Likely a dark smoky quartz crystal with a pale quartz matrix; vitreous luster and prismatic, striated faces. Quartz has Mohs hardness 7, trigonal crystal structure, no cleavage, and specific gravity about 2.65.
Formation & geological history
Quartz crystallizes from silica-rich hydrothermal fluids or pegmatitic pockets; smoky coloration commonly results from natural radiation acting on trace aluminum. The specimen’s age cannot be determined from the image.
Uses & applications
Quartz is used in jewelry, ornament, and electronics; this small specimen is mainly suited to collecting or display.
Geological facts
Smoky quartz’s color ranges from pale gray to nearly black, and may fade with prolonged exposure to intense sunlight.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and lack of cleavage; smoky quartz occurs in granites and alpine-type veins worldwide. The image is too indistinct for a confident species-level identification.
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