mineral

Quartz druzy geode

Quartz, silicon dioxide (SiO₂), microcrystalline/druzy variety

AI-generated identification · may be incorrect

Typically colorless to milky white, with sparkling glassy crystal surfaces and irregular botryoidal or geode-like form; Mohs hardness 7, vitreous luster, hexagonal crystal structure, no prominent cleavage, and specific gravity about 2.65.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater deposited quartz crystals in cavities or fractures, commonly in volcanic rocks or sedimentary nodules. The specimen’s exact geological age cannot be determined from the image; formation may range from recent to hundreds of millions of years old.

Uses & applications

Used as a decorative and lapidary specimen, in jewelry and carvings; quartz is also important in glassmaking, electronics, abrasives, and construction aggregates.

Geological facts

The fine sparkling coating is called druzy or druse, formed when many tiny quartz crystals grow together. The interior appears pale and translucent rather than strongly colored amethyst.

Field identification & locations

Identify by its glassy sparkle, hardness, lack of cleavage, and inability to scratch it with a steel knife; quartz can scratch ordinary glass. Common localities include Brazil, Uruguay, Mexico, Morocco, and the United States.