mineral
Druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline-to-fine crystalline drusy quartz
AI-generated identification · may be incorrectWhite, glittering crystal coating on a tan host rock; vitreous luster, hexagonal crystal system, Mohs hardness 7, no cleavage, specific gravity about 2.65. The exact host rock and any associated minerals are not identifiable from the image alone.
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Physical properties
White, glittering crystal coating on a tan host rock; vitreous luster, hexagonal crystal system, Mohs hardness 7, no cleavage, specific gravity about 2.65. The exact host rock and any associated minerals are not identifiable from the image alone.
Formation & geological history
Quartz crystals precipitated from silica-rich groundwater in cavities or fractures in the host rock. Such deposits form across many geological ages and settings.
Uses & applications
Primarily collected and displayed as a mineral specimen; druzy quartz is also used in jewelry and decorative objects.
Geological facts
“Druzy” describes a surface covered with many tiny crystals rather than a distinct mineral species.
Field identification & locations
Look for a sparkling coating of closely packed quartz crystals; quartz scratches glass and is harder than a steel knife. Quartz druzy occurs worldwide in veins and geodes, including notable deposits in Brazil, Uruguay, and Morocco.
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