mineral

Quartz geode or druzy quartz specimen

Quartz, silicon dioxide (SiO₂), likely microcrystalline/drusy quartz coating a host rock

AI-generated identification · may be incorrect

Pale cream to white, sugary crystalline surface with vitreous-to-dull luster; quartz hardness is Mohs 7, lacks cleavage, and has a hexagonal crystal structure. The brown base is likely iron-stained host rock or chalcedony.

Identified August 8, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich groundwater deposited quartz crystals in a cavity or along a rock fracture, followed by iron-oxide staining. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Used as a decorative and collecting specimen; quartz is also important in glass, electronics, abrasives, and engineered stone. This piece appears modestly valuable as a display specimen.

Geological facts

The sparkling texture is called drusy or druzy quartz, consisting of many tiny crystal points rather than one large crystal. Quartz is one of Earth’s most abundant minerals.

Field identification & locations

Identify by its granular crystal sparkle, scratch resistance, and lack of cleavage; a steel knife should not scratch quartz. Common sources include Brazil, Uruguay, Mexico, Morocco, and the western United States.