General Information:
Chemical Formula:
Ca4Mg(AsO3OH)2(AsO4)2·11(H2O)
Composition:
(Molecular Weight = 940.48 gm)
Calcium 17.05 % Ca
Magnesium 2.58 % Mg
Arsenic 31.87 % As
Hydrogen 2.57 % H
Oxygen 45.93 % O
Empirical Formula:
Ca4Mg(AsO3OH)2(AsO4)2·11(H2O)
Environment:
Secondary mineral formed in the oxidation zone of arsenical ore deposits.
Locality:
Riechelsdorf, Hessen, Germany.
Name Origin:
Named for its magnesia content and the similarity to pharmacolite.
Physical Properties:
Cleavage:
[100] Perfect, [010] Perfect
Color:
colorless or silky white.
Density:
2.58
Diaphaniety:
Transparent to Translucent
Habits:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Fibrous - Crystals made up of fibe rs.
Hardness:
1-2 - Between Talc and Gypsum
Luminescence:
Non-fluorescent.
Luster:
Pearly
Streak:
white
More details...