General Information:
Chemical Formula:
FeAs2
Composition:
(Molecular Weight = 205.69 gm)
Iron 27.15 % Fe
Arsenic 72.85 % As
Empirical Formula:
Fe2+As2
Name Origin:
Named after its locality Lolling, Austria.
Physical Properties:
Cleavage:
[001] Distinct
Color:
silvery white or tarnish gray.
Density:
7.1 - 7.7, Average = 7.4
Diaphaniety:
Opaque
Habits:
Massive - Granular - Common texture observed in granite and other igneous rock., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Twinning Common - Crystals are usu ally twinned.
Hardness:
5 - Apatite
Luminescence:
Non-fluorescent.
Luster:
Metallic
Streak:
grayish black
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