General Information:
Chemical Formula:
Ca2(Mn,Mg)(AsO4)2·2(H2O)
Composition:
(Molecular Weight = 441.30 gm)
Calcium 18.16 % Ca
Magnesium 1.38 % Mg
Manganese 9.34 % Mn
Arsenic 33.95 % As
Hydrogen 0.91 % H
Oxygen 36.25 % O
Empirical Formula:
Ca2Mn2+0.75Mg0.25(AsO4)2·2(H2O)
Locality:
Harstig mine, Pajsberg near Persberg, Varmland, Sweden.
Name Origin:
Named for Georg Brandt (1694-1768), Swedish chemist.
Physical Properties:
Cleavage:
[010] Perfect, [001] Good
Color:
colorless or white.
Density:
3.67
Diaphaniety:
Transparent to Translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Striated - Parallel lines on crystal surface or cleavage face., Radial - Crystals radiate from a center without pro ducing stellar forms (e.g. stibnite)
Hardness:
3.5 - Copper Penny
Luster:
Vitreous (Glassy)
Streak:
white
More details...