metamorphic
Pyrite-bearing Schist
Pyritic Quartz-Mica Schist with FeS2 inclusion
Hardness: 5.5-6.5 (pyrite), 2.5-3 (mica/schist matrix); Color: Brass-yellow metallic flecks in a gray/black foliated matrix; Luster: Metallic for inclusions, pearly to dull for matrix; Structure: Foliated schistose texture; Cleavage: One perfect plane in mica grains.
- Hardness
- 5
- Color
- Brass-yellow metallic flecks in a gray/black foliated matrix
- Luster
- Metallic for inclusions, pearly to dull for matrix
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Physical properties
Hardness: 5.5-6.5 (pyrite), 2.5-3 (mica/schist matrix); Color: Brass-yellow metallic flecks in a gray/black foliated matrix; Luster: Metallic for inclusions, pearly to dull for matrix; Structure: Foliated schistose texture; Cleavage: One perfect plane in mica grains.
Formation & geological history
Formed under regional metamorphism of clay-rich sedimentary rocks (like shale) at medium temperatures and pressures. The presence of pyrite indicates a reduction environment during the geological process, often associated with hydrothermal activity or organic rich sediments.
Uses & applications
Schist is used as decorative stone and in landscaping. Pyrite is an ore of sulfur and a source of sulfuric acid, and is historically used for its sparking properties and as a collector's mineral.
Geological facts
Pyrite is famously known as 'Fool's Gold' because its brassy color often confused prospectors. Schist is the intermediate metamorphic step between phyllite and gneiss.
Field identification & locations
Identify in the field by looking for distinct layers (foliation) and shiny, metallic cubic or granular crystals that produce a dark greenish-black streak when rubbed on ceramic. Common in mountain belts and metamorphic terrains.
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