|
Hard- ness |
Cleavage |
Fracture |
Trans- parency |
10% HCl Reaction |
SG |
Luster |
Color |
Streak |
Xtal Form |
Mineral Class |
Comments | marcasite | 6.00 | poor | conchoidal | opaque | none | 4.80 | metallic | gold | black | faceted | sulfides | Often flattened twinned crystals in the form of spearheads. greenish-black streak. |
|