mineral side rock
Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
Hardness: 6-6.5 (Pyrite). Color: Metallic brass-yellow (cube) in a white or tan matrix. Luster: Metallic. Crystal Structure: Isometric/Cubic. Cleavage: Indistinct. Specific Gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Metallic brass-yellow (cube) in a white or tan matrix
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 (Pyrite). Color: Metallic brass-yellow (cube) in a white or tan matrix. Luster: Metallic. Crystal Structure: Isometric/Cubic. Cleavage: Indistinct. Specific Gravity: 4.9-5.2.
Formation & geological history
Forms in a variety of geological environments, including hydrothermal veins, sedimentary rocks (shale, limestone), and metamorphic rocks. This specific specimen appears to be a cube emerging from a sedimentary or clay-rich host matrix.
Uses & applications
Major ore of sulfur (historically), used in jewelry (as marcasite), and highly popular as a collector's mineral. Occasionally used in the production of sulfuric acid.
Geological facts
Pyrite is famously known as 'Fool's Gold' because its color and high specific gravity can lead novice prospectors to mistake it for gold. However, pyrite is much harder and more brittle than real gold.
Field identification & locations
Identified by its distinctive perfect cubic shape and metallic 'brassy' luster. Can be found globally, with famous cubic specimens coming from Navajun, Spain. To identify in the field, look for the 'iron' smell when struck and its inability to be scratched by a copper penny.
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