mineral

Pyrite-rich rock (iron pyrite specimen)

Pyrite, FeS₂, likely in a sulfide-rich matrix

AI-generated identification · may be incorrect

Brassy yellow metallic luster with granular, uneven crystals; pyrite has Mohs hardness 6–6.5, cubic crystal symmetry, no prominent cleavage, and specific gravity about 5.0. The dark, irregular surface suggests a natural matrix rather than a polished specimen.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Pyrite commonly forms hydrothermally in sulfide veins and sedimentary rocks, or by replacement in marine sediments; individual specimens can range from ancient Precambrian to geologically recent deposits. Exact age and locality cannot be determined from the image.

Uses & applications

Used historically as a sulfur source and occasionally for sulfuric-acid production; attractive crystals are collected and displayed, but it is not generally used as a gemstone. Common specimens usually have modest market value.

Geological facts

Often called “fool’s gold,” pyrite is harder and more brittle than gold and commonly produces a dark streak, unlike gold’s yellow streak. Oxidation can generate acidic drainage and yellow-brown iron sulfates.

Field identification & locations

Identify by its metallic brass color, high density, brittle fracture, and possible cubic crystal faces; a streak test, hardness test, and locality information would confirm it. Common worldwide, including Spain, Peru, Italy, China, and the United States.