mineral

Quartz-rich geode or druzy quartz

Quartz (SiO₂), possibly in a chalcedony/geode matrix

AI-generated identification · may be incorrect

White to pale honey-colored, translucent quartz crystals with a vitreous to sugary drusy luster; Mohs hardness 7, hexagonal crystal structure, no cleavage, and specific gravity about 2.65. The specimen appears weathered and may include iron-oxide staining or minor calcite.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich groundwater deposited quartz crystals lining a cavity in volcanic rock or filling a silica-rich nodule. Exact geological age and locality cannot be determined from the image.

Uses & applications

Commonly used as a mineral specimen, decorative stone, and lapidary material; attractive druzy surfaces may be used in jewelry. Small common pieces generally have modest value.

Geological facts

The granular sparkling surface is characteristic of druzy quartz, formed by many tiny intergrown crystals rather than one large crystal. A steel knife should not scratch quartz, while quartz will scratch ordinary glass.

Field identification & locations

Look for glassy sparkle, hardness, translucent edges, and conchoidal fracture; acid testing can help distinguish calcite, which fizzes in dilute hydrochloric acid. Similar specimens occur worldwide, especially in Brazil, Uruguay, Mexico, Morocco, and the western United States.