mineral

Quartz–pyrite druzy slab

Quartz (SiO₂) with pyrite (FeS₂), likely in a geode or hydrothermal vein

AI-generated identification · may be incorrect

Gray to translucent white drusy quartz crystals coat a dark matrix with brassy metallic pyrite. Quartz hardness is 7, vitreous luster, hexagonal crystals, and poor cleavage; pyrite hardness is 6–6.5, metallic luster, and cubic crystals. Exact composition is uncertain from a photograph.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Typically forms when silica-rich fluids fill cavities or fractures, depositing quartz crystals and later pyrite. Formation age depends on the host deposit and cannot be determined visually; such material is common in Paleozoic to younger hydrothermal systems.

Uses & applications

Used as decorative slabs, mineral specimens, and lapidary pieces; quartz is industrially important, while pyrite has limited economic use. Value is mainly aesthetic and collectible.

Geological facts

The brassy grains may also include marcasite or chalcopyrite, which can resemble pyrite. Pyrite can tarnish or oxidize in humid conditions, producing acidic sulfate minerals.

Field identification & locations

Common sources include Peru, Mexico, Morocco, Spain, and the United States. Look for sparkly drusy quartz and test metallic grains cautiously with a steel point; a gemological or chemical test is needed for confident sulfide identification.