Marcasite
Fun Fact: Marcasite is a polymorph, which means it can take many forms.
Introduction: So called because of an historic connection to a province in Persia, marcasite is a polymorph, which means it can take 'many forms'. It has the same chemical composition as pyrite but crystallizes in different systems. Marcasite has a metallic brass colour and is most common in limestone, some shales and dolomites.
Distribution: Rosh Pinah, Brandberg West Mine and the Crystal Tin Mine 25km north-west of Omaruru
Composition: Sulphide
Crystal system: Orthorhombic
Lustre: Metallic
Streak: Green-black
Hardness: 6-6.5
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