Ershovite

General Information:
 Chemical Formula:
Na4K3(Fe++,Mn++,Ti)2Si8O20(OH)4·4(H2O)
 Environment:
In hyperagpaitic pegmatites.
 IMA Status:
Approved IMA
 Locality:
Mt. Koashva, SE part of the Khibina alkaline massif, Kola Peninsula, Russia.
 Name Origin:
Named after Prof. Vadim Viktorovich Ershov (1939-1989) of the Moscow Mining Institute.
Physical Properties:
 Cleavage:
[100] Perfect, [010] Perfect
 Color:
olive green, brownish green, or yellowish green.
 Density:
2.75 - 2.69, Average = 2.72
 Diaphaniety:
Transparent
 Habits:
Anhedral Grains - Granular minerals without the expression of crystal shapes, Fibrous - Crystals made up of fibers.,
 Hardness:
2.5-3 - Finger Nail-Calcite
 Luminescence:
Non-fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
More details...