Marcasite
From cornish semiconductor corporation
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- Lustre:Metallic, Sub-Metallic
- Transparency:Opaque
- Colour:Pale brass-yellow, tin-white on fresh exposures.
- Streak:Dark-gray to black.
- Hardness:6 - 6½ on Mohs scale
- Tenacity:Brittle
- Cleavage:Distinct/Good Distinct on {101}. {110} in traces.
- Fracture:Conchoidal, Sub-Conchoidal