Panasqueira Mine, Couto Mineiro da Panasqueira, Panasqueira, Covilhã, Castelo Branco District, Portugal
© Kristalle and Crys
Formula: FeAsS
System: Monoclinic   
Colour:  Silver-white to ...
Lustre:  Metallic   
Hardness: 5½ - 6
Member of: Arsenopyrite Group
Name: Named for its composition, a contraction of the antiquated term "arsenical pyrite."

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Occurrences of Arsenopyrite

Geological Setting:    High temperature gold-quartz or tin hydrothermal veins, pegmatites, contact metamorphic rocks, gneisses, schists.

Physical Properties of Arsenopyrite

Lustre:    Metallic
Diaphaneity (Transparency):    Opaque
Colour:    Silver-white to steel-grey
Streak:    Grey-black
Hardness (Mohs):    5½ - 6
Hardness (Vickers):    VHN100=1081 kg/mm2
Comment:    VHN on (001) section
Tenacity:    Brittle
Cleavage:    Distinct/Good
Distinct on {001}; {010} in traces
Fracture:    Irregular/Uneven
Density (measured):    6.07(15) g/cm3
Density (calculated):    6.18 g/cm3

Chemical Properties of Arsenopyrite

Formula:    FeAsS
Essential elements:    As, Fe, S
All elements listed in formula:    As, Fe, S
Analytical Data:    O'Brien mine, Cobalt, Canada.

Fe (34.53)
Co (0.09)
Bi (0.79)
As (44.34)
S (20.22)
Total (99.97)

Common Impurities:    Ag,Au,Co,Sn,Ni,Sb,Bi,Cu,Pb

Photo :

This arsenopyrite sample is about 7x6 cm and is from Obira mine, Oita, Japan. It is formed with fluorite and quartz.

This sample of arsenopyrite is displayed in the Smithsonian Museum of Natural History.

     This large arsenopyrite crystal formation is about 13x30 cm and is from Obira mine, Oita, Japan.

This sample of arsenopyrite is about 8x10 cm and is from Trepca mine, Srbija, Yugoslavia. It is formed with pyrite and sphalerite.
More Info > Mindat: Arsenopyrite

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