mineral

Pyrite-bearing rock, likely quartz vein

Pyrite (FeS₂) in quartz-rich host rock

AI-generated identification · may be incorrect

Brassy metallic luster, blocky/sparkling surfaces, and dark gray to bluish host; pyrite hardness 6–6.5 Mohs, cubic crystal system, poor cleavage, and specific gravity about 5.0. The host appears harder, glassy quartz with possible weathering stains.

Identified August 27, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite commonly forms hydrothermally in quartz veins and sulfide ore deposits through fluid circulation in fractures; the specimen’s exact geological age cannot be determined from the image. Oxidation produces orange-brown iron-oxide staining around exposed sulfides.

Uses & applications

Pyrite is collected as a mineral specimen and historically processed for sulfur and sulfuric acid; quartz veins are important sources of gold and other metals. This piece is primarily suitable for collecting, not construction or jewelry.

Geological facts

Pyrite is known as “fool’s gold,” but its pale brass color, brittleness, cubic forms, and lack of malleability distinguish it from gold. Associated minerals may include chalcopyrite, arsenopyrite, or minor native gold.

Field identification & locations

Look for metallic brass color, angular or cubic faces, and a dark streak rather than gold’s yellow streak and softness; a steel scratch test should not easily scratch pyrite. Common settings include hydrothermal veins, metamorphic rocks, and sedimentary sulfide deposits worldwide.