General Information:
Chemical Formula:
(Na,K)17Fe+++TiSi16O29(OH)30·2(H2O)
Composition:
(Molecular Weight = 2,066.91 gm)
Potassium 13.24 % K
Sodium 11.12 % Na
Titanium 2.32 % Ti
Iron 2.70 % Fe
Silicon 21.74 % Si
Hydrogen 1.66 % H
Oxygen 47.22 % O
Empirical Formula:
Na10K7Fe3+TiSi16O29(OH)30·2(H2O)
Environment:
Ultra-agpaitic pegmatites.
IMA Status:
Approved IMA
Locality:
Mt. Ruasvumchorr and Mt. Koashva, Khibiny massif, Kola Peninsula, Russia.
Name Origin:
Named from the Finnish "tietta", science or knowldge, for the first science station in Khibiny.
Physical Properties:
Cleavage:
[100] Perfect, [010] Perfect
Color:
colorless, grayish white, or dark gray.
Density:
2.42
Diaphaniety:
Transparent
Habits:
Aggregates - Made of numerous individual crystals or clusters., ,
Hardness:
3 - Calcite
Luster:
Vitreous - Silky
Streak:
white
More details...