Vistepite

General Information:
 Chemical Formula:
Mn++4Sn++++B2(SiO4)4(OH)2
 Composition:
(Molecular Weight = 762.43 gm)
Manganese 28.82 % Mn
Silicon 14.73 % Si
Tin 15.57 % Sn
Boron 2.84 % B 
Hydrogen 0.26 % H 
Oxygen 37.77 % O 
 Empirical Formula:
Mn2+4SnB2(SiO4)4(OH)2
 IMA Status:
Approved IMA
Physical Properties:
 Cleavage:
[???] Good
 Color:
yellowish orange.
 Density:
3.67
 Diaphaniety:
Transparent
 Hardness:
4.5 - Between Fluorite and Apatite
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...