Cock's comb Marcasite displaying tabular, wedge shaped crystals.
CHEMISTRY FeS2 Iron sulfide
CRYSTALLOGRAPHY Orthorhombic
CRYSTAL GROWTH AND HABITS Crystals of Marcasite are commonly tabular, prismatic, commonly with curved faces. Marcasite can also be stalactitic, reniform and fine grained to massive. Cock's comb (cockscomb) marcasite is the name given to the tabular crystals that consist of repeated twinning forming fan like sprays.
COLOR AND OTHER OPTICAL PROPERTIES
HARDNESS SPECIFIC GRAVITY
LUSTER STREAK
BREAKABILITY
OCCURRENCE
ASSOCIATED MINERALS