mineral

Quartz geode/druse specimen

Quartz, silicon dioxide (SiO₂), likely coating a weathered host rock

AI-generated identification · may be incorrect

White to translucent, glassy crystals with sparkling druse; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The brown outer material is likely iron-stained host rock or chalcedony; crystal habit is typically hexagonal.

Identified September 1, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich fluids precipitate quartz crystals in cavities, fractures, or vesicles, commonly in volcanic rocks; the specimen’s exact geological age cannot be determined from the image. Iron oxidation likely produced the ochre-brown coloration.

Uses & applications

Used as a decorative and collectible specimen, and occasionally in lapidary work; quartz is also important in glassmaking, electronics, and construction aggregate.

Geological facts

The sparkling surface is called drusy or druzy quartz, consisting of many tiny crystals. Quartz is one of Earth’s most abundant minerals and is resistant to weathering.

Field identification & locations

Identify by its glassy luster, hardness, lack of cleavage, and inability to scratch with a steel knife easily; common sources include Brazil, Uruguay, Mexico, Morocco, and U.S. volcanic regions. Avoid acid tests because they are unnecessary and may damage the specimen.