EPISTOLITE


Meaning of EPISTOLITE in English

General Information:

Chemical Formula:

Na5Ti+++Nb2Si4O12O5F·5(H2O)

Composition:

(Molecular Weight = 842.05 gm)

Sodium 13.65 % Na

Titanium 5.69 % Ti

Niobium 22.07 % Nb

Silicon 13.34 % Si

Hydrogen 1.20 % H

Oxygen 41.80 % O

Fluorine 2.26 % F

Empirical Formula:

Na5TiNb2Si4O17F·5(H2O)

Physical Properties:

Cleavage:

[001] Perfect, [110] Distinct

Color:

white, yellowish white, gray, or light brown.

Density:

2.65 - 2.89, Average = 2.77

Diaphaniety:

Translucent

Hardness:

1-1.5 - Talc or a little harder

Luster:

Pearly

Streak:

white

More details...

Mineralogy database English vocab.      Английский словарь базы данных минералогии .