General Information:
Chemical Formula:
Ca2(Zn,Mn)Fe+++4(AsO4)4(OH)6·6(H2O)
Composition:
(Molecular Weight = 1,132.66 gm)
Calcium 7.08 % Ca
Manganese 0.97 % Mn
Zinc 4.62 % Zn
Iron 19.72 % Fe
Arsenic 26.46 % As
Hydrogen 1.60 % H
Oxygen 39.55 % O
Empirical Formula:
Ca2Zn0.8Mn2+0.2Fe3+4(AsO4)4(OH)6·6(H2O)
Environment:
Secondary Fe arsenate.
IMA Status:
Approved IMA 1981
Locality:
Sterling Hill mine, Ogdensburg, New Jersy, USA.
Name Origin:
Named for the locality.
Physical Properties:
Cleavage:
[001] Perfect, [010] Fair, [100] Poor
Color:
brownish red, dark brown, or reddish orange.
Density:
2.92 - 3.11, Average = 3.01
Diaphaniety:
Translucent
Habits:
Bladed - Aggregates of thin lath-like crystals (e.g. kyanite)., Encrustations - Forms crust-like aggregates on matrix., Micaceous - Platy texture with "flexible" plates.
Hardness:
2 - Gypsum
Luminescence:
Non-fluorescent.
Luster:
Resinous
Streak:
brown yellow
More details...