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 %
CaMagnesium 3.98 %
MgAluminum 6.45 %
AlIron 2.67 %
FeSilicon 17.26 %
SiBoron 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
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