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Marcasite
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The mineral marcasite, sometimes called "white iron pyrite", is iron sulfide with orthorhombic crystal structure. It is physically and crystallographically distinct from pyrite, which is iron sulfide with cubic crystal structure. Wikipedia
Crystal system: Orthorhombic
Formula: FeS2
Cleavage: Cleavage, rather distinct, in traces
Color: Tin-white on fresh surface, pale bronze-yellow, darkening on exposure, iridescent tarnish
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Diaphaneity: Opaque
Fracture: Irregular/Uneven