General Information:
Chemical Formula:
(Fe++,Mg)3Si4O10(OH)2
Composition:
(Molecular Weight = 473.89 gm)
Iron 35.35 % Fe
Silicon 23.71 % Si
Hydrogen 0.43 % H
Oxygen 40.51 % O
Empirical Formula:
Fe2+3Si4O10(OH)2
Name Origin:
Named after its occurrence in Minnesota, USA.
Physical Properties:
Cleavage:
[001] Perfect
Color:
pale green.
Density:
3.01
Diaphaniety:
Translucent
Habits:
Foliated - Two dimensional platy forms., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite),
Hardness:
1.5-2 - Talc-Gypsum
Luster:
Pearly
Streak:
white
More details...