mineral

Quartz geode

Microcrystalline and crystalline quartz (SiO₂), likely with minor chalcedony or calcite

AI-generated identification · may be incorrect

White to pale honey-colored, drusy sparkling crystals lining cavities; vitreous luster, trigonal crystal structure, Mohs hardness 7, no cleavage, conchoidal fracture, specific gravity about 2.65. The rough, cavity-filled form is consistent with a small geode or vuggy quartz specimen.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater deposits quartz crystals inside gas bubbles or open cavities in volcanic rock, commonly basalt; growth may occur over thousands to millions of years, often during cooling and later groundwater circulation.

Uses & applications

Used as a mineral-collection specimen, ornamental stone, and sometimes in jewelry or décor; this rough piece is mainly collectible rather than industrial-grade.

Geological facts

The sparkling surface is called druse or druzy quartz. Honey coloration may result from iron staining or inclusions; the image does not clearly establish whether some cavity material is calcite.

Field identification & locations

Common in volcanic regions and sedimentary geodes, especially Brazil, Uruguay, Mexico, and the United States. Confirm quartz with a glass-scratching test; calcite, if present, fizzes in dilute hydrochloric acid.