metamorphic
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
Hardness: 6-6.5 for pyrite crystals and 5.5-6 for the rock matrix; Color: Bronzy brown with golden metallic flecks; Luster: Metallic to sub-metallic; Crystal structure: Monoclinic/triclinic foliation with isometric pyrite crystals; Specific Gravity: 2.7 - 5.0 depending on pyrite concentration.
- Hardness
- 6-6
- Color
- Bronzy brown with golden metallic flecks
- Luster
- Metallic to sub-metallic
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Physical properties
Hardness: 6-6.5 for pyrite crystals and 5.5-6 for the rock matrix; Color: Bronzy brown with golden metallic flecks; Luster: Metallic to sub-metallic; Crystal structure: Monoclinic/triclinic foliation with isometric pyrite crystals; Specific Gravity: 2.7 - 5.0 depending on pyrite concentration.
Formation & geological history
Formed through regional metamorphism of argillaceous sediments or volcanic rocks under high temperature and pressure, causing recrystallization and the development of foliation with sulfide mineralization.
Uses & applications
Used primarily as an educational geological specimen, occasionally in ornamental stonework or lapidary art.
Geological facts
Often referred to as 'fool's gold' schist because of the glittering pyrite flakes embedded within the foliated metamorphic rock matrix.
Field identification & locations
Identified in the field by its distinct foliated texture combined with reflective metallic brass-yellow or bronze specks. Commonly found in metamorphic belts worldwide.
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