metamorphic
Pyrite in Slate
Iron Disulfide (FeS2) in Low-grade Metamorphic Rock
Hardness: 6-6.5 (Pyrite), 2.5-4 (Slate); Color: Brassy yellow cubes in a grey/black matrix; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.
- Hardness
- 6-6
- Color
- Brassy yellow cubes in a grey/black matrix
- Luster
- Metallic
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Physical properties
Hardness: 6-6.5 (Pyrite), 2.5-4 (Slate); Color: Brassy yellow cubes in a grey/black matrix; Luster: Metallic; Crystal Structure: Isometric (cubic); Cleavage: Indistinct; Specific Gravity: 4.9-5.2.
Formation & geological history
Formed in oxygen-poor environments where sulfate-reducing bacteria produce hydrogen sulfide that reacts with iron. The host slate formed through the low-grade metamorphism of shale during regional tectonic activity.
Uses & applications
Pyrite is used in the production of sulfur dioxide and sulfuric acid. Slate is widely used in construction for roofing and flooring. These combined specimens are primarily for education and mineral collecting.
Geological facts
Often called 'Fool's Gold' because its color resembles real gold, though it is much harder and more brittle. Famous pyrite cubes are found in the Victoria mine, Navajún, Spain.
Field identification & locations
Identify by the metallic brassy luster and cubic crystal habit against the dull, dark, foliated background of the slate. Commonly found in sedimentary basins and metamorphic belts worldwide.
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