mineral

White quartz geode

Quartz, silicon dioxide (SiO₂), likely a druzy quartz geode

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous to pearly luster, white to colorless crystals, no cleavage, conchoidal fracture, and specific gravity about 2.65. The specimen shows a hollow cavity lined with fine quartz crystals, possibly with minor chalcedony or calcite.

Identified August 11, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits crystals inside a cavity or vesicle in volcanic rock; the cavity may develop from gas bubbles or dissolution. Geode formation can occur over long periods from Paleozoic to Cenozoic volcanic or sedimentary-hosted environments.

Uses & applications

Used as a decorative and collecting specimen; larger polished geodes are used in interior design, while quartz is important in glass, electronics, abrasives, and engineered materials.

Geological facts

The sparkling surface is called druzy quartz. Colorless or white quartz is generally more common than amethyst or citrine varieties.

Field identification & locations

Identify by its hollow interior, glassy granular crystals, hardness, and lack of cleavage; quartz will scratch glass, whereas calcite will not. Common sources include Brazil, Uruguay, Mexico, Morocco, and the United States.