General Information:
Chemical Formula:
(Fe,Ni)9S8
Composition:
(Molecular Weight = 771.94 gm)
Iron 32.56 % Fe
Nickel 34.21 % Ni
Sulfur 33.23 % S
Empirical Formula:
Fe2+4.5Ni4.5S8
Environment:
Common as the sulfide phase in basic and ultra-basic intrusive igneous rocks.
Locality:
TL: Espedalen, near Lillihammer, Norway.
Name Origin:
Named after the Irish natural historian, J. B. Pentland (1797-1873).
Physical Properties:
Cleavage:
None
Color:
bronze or brown.
Density:
4.6 - 5, Average = 4.8
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Granular - Generally occurs as anhedral to subhedral crystals in matrix., Granular - Generally occurs as anhedral to subhedral crystals in mat
Hardness:
3.5-4 - Copper Penny-Flourite
Luminescence:
None.
Luster:
Metallic
Streak:
greenish black
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