Carbon (lignite)Amorphous
Jet
Carbon (lignite)
MineraloidsChemical FormulaCarbon (lignite)
Crystal SystemAmorphous
Mohs Hardness3
Specific Gravity1.3
ColorBlack
LusterVitreous to waxy
StreakBrown
CleavageNone
FractureConchoidal
Occurrence
Fossilized wood. Used in jewelry since Bronze Age. Whitby jet is famous.