mineral

Quartz-rich druse specimen

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor feldspar or mica

AI-generated identification · may be incorrect

Hardness 7 Mohs; mostly colorless to milky, with white, tan, and rusty-brown coatings; vitreous luster and translucent grains. Crystals are trigonal quartz, appearing as sparkling druzy aggregates; cleavage is absent and fracture is conchoidal.

Identified September 13, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal or groundwater solutions deposited quartz in cavities, fractures, or weathered host rock; iron oxides produced the brown coloration. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used primarily as a mineral specimen, lapidary material, and decorative aggregate; attractive druzy quartz may be set in jewelry or used in polished cabochons. Common pieces have modest commercial value.

Geological facts

The glittering surface is drusy quartz—many tiny crystals growing outward from a substrate. Quartz is one of Earth’s most abundant minerals and is chemically resistant, often surviving erosion as sand.

Field identification & locations

Identify by its glassy sparkle, hardness, lack of cleavage, and inability to scratch with a steel knife while scratching ordinary glass. Common in hydrothermal veins, geodes, cavities, and weathered mineralized rocks worldwide.