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Name: |
marcasite |
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Class: |
Sulfides |
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Chemistry: |
FeS2 Iron Sulfide |
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Color(s): |
pale-yellow to brown metallic, Streak:grayish or brownish black |
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Hardness: |
6 - 6.5 |
SpecGrav: |
4.5 - 5.0 |
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Fracture: |
uneven |
Cleavage: |
distinct 2 directions |
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Crystal: |
Orthorhombic (twinning common - coxcomb pattern not unusual) |
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Envronment: |
hydrothermal deposits, tends to form at lower temperature and in acid solutions whereas pyrite forms at higher temperature and from more basic solutions. |
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Association: |
pyrite, quartz, galena, magnetite, feldspars |
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Locals: |
| Mexico | Germany | France | Missouri/USA | |
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Misc: |
name comes from Arabic word used for pyrite "markaschatsa", "fire stone". It may disintegrate with time in collections as it air oxidizes. |
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Photos |
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