General Information:
Chemical Formula:
(Ca,Mn++)4Be3Si6O17(OH)4·3(H2O)
Composition:
(Molecular Weight = 764.79 gm)
Calcium 15.72 % Ca
Manganese 7.18 % Mn
Beryllium 3.54 % Be
Silicon 22.03 % Si
Hydrogen 1.32 % H
Oxygen 50.21 % O
Empirical Formula:
Ca3Mn2+Be3Si6O17(OH)4·3(H2O)
Environment:
In vugs in a nepheline-syenite pegmatite. Always overgrown by a crust of chiavennite.
IMA Status:
Approved IMA
Locality:
Vevja larvikite quarry, Tvedalen, Brunlanes, Vestfold Co., Norway.
Name Origin:
Named for the type locality.
Physical Properties:
Cleavage:
[???] Perfect
Color:
white, pale gray, or beige.
Density:
2.541
Diaphaniety:
Transparent
Hardness:
4.5 - Between Fluorite and Apatite
Luster:
Vitreous (Glassy)
Streak:
white
More details...