mineral

Quartz geode/druse specimens

Quartz, silicon dioxide (SiO₂), likely iron-stained drusy quartz in a vuggy host rock

AI-generated identification · may be incorrect

Typically Mohs hardness 7, vitreous luster, transparent to translucent crystals, hexagonal crystal structure, and no cleavage; the yellow-brown coloration is likely limonite/goethite staining. The surrounding gray material may be chalcedony, quartz matrix, or carbonate rock.

Identified September 7, 2026More mineral →

Explore Quartz geode/druse specimens in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely formed when silica-rich groundwater deposited quartz crystals in cavities or fractures, with later iron-oxide staining. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as mineral-collection specimens, décor, and occasionally lapidary material; attractive crystals may have modest display value.

Geological facts

The sparkling surface is drusy quartz—many tiny crystals coating a cavity rather than one large crystal. Iron staining commonly produces golden, orange, and brown tones.

Field identification & locations

Identify by glassy sparkle, six-sided quartz crystal forms, hardness, and lack of cleavage; quartz should scratch glass but not be scratched by a steel knife. Common worldwide in volcanic, hydrothermal, and sedimentary settings.