FERSMANITE


Meaning of FERSMANITE in English

General Information:

Chemical Formula:

(Ca,Na)4(Ti,Nb)2Si2O11(F,OH)2

Composition:

(Molecular Weight = 543.48 gm)

Sodium 1.06 % Na

Calcium 27.65 % Ca

Titanium 13.21 % Ti

Niobium 8.55 % Nb

Silicon 10.34 % Si

Hydrogen 0.09 % H

Oxygen 33.85 % O

Fluorine 5.24 % F

Empirical Formula:

Ca3.75Na0.25Ti1.5Nb0.5Si2O11F1.5(OH)0.5

Environment:

Associated with feldspar and aegirite in veins in nepheline-syenite.

Locality:

Chibines Mountains, Kola peninsula, Russia.

Name Origin:

Named for Alexander Yevgenievich Fersman (1883-1945), Russian mineralogist and geochemist.

Physical Properties:

Cleavage:

None

Color:

golden yellow, resin brown, light brown, or dark brown.

Density:

3.44

Diaphaniety:

Transparent to translucent

Habits:

Pseudo Tetragonal - Crystals show a tetragonal shape., ,

Hardness:

5.5 - Knife Blade

Luster:

Vitreous (Glassy)

Streak:

brownish white

More details...

Mineralogy database English vocab.      Английский словарь базы данных минералогии .