General Information:
Chemical Formula:
Ca19(Al,Mg,Fe,Ti)13(B,Al,[ ])5Si18O68(O,OH)10
Composition:
(Molecular Weight = 2,928.82 gm)
Calcium 26.00 % Ca
Magnesium 3.98 % Mg
Aluminum 6.45 % Al
Iron 2.67 % Fe
Silicon 17.26 % Si
Boron 0.96 % B
Hydrogen 0.07 % H
Oxygen 42.61 % O
Empirical Formula:
Ca19Al7Mg4.8Fe3+0.9Fe2+0.5B2.6Si18O76(OH)2
Environment:
Found with grossular and serpentine-group minerals in a serpentinized skarn. Isostructural with vesuvianite.
IMA Status:
Approved IMA (Dana # Added)
Locality:
Wilui River, Yakutia, Russia.
Name Origin:
Named after the discovery locality.
Physical Properties:
Cleavage:
[100] Poor
Color:
dark green.
Density:
3.36
Habits:
Euhedral Crystals - Occurs as well-formed crystals showing good external form., ,
Hardness:
6 - Orthoclase
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
colorless
More details...