Epistolite

Overview

(Na,Ca,Fe)2((Na,Ti)4(Nb2(O,H2O)4Si4O14)(OH,F)2)·2(H2O)
Fluorescence: none	Not Radioactive	Magnetic: no

Description

Physical Properties

Property	Value
Density	2.65-2.89 g/cc
Hardness - Mohs	Epistolite - 1.0-1.5  10 Diamond 9 Carborundum 8 Topaz 7 Quartz 6 Orthoclase 5 Apatite 4 Fluorite 3 Calcite 2 Gypsum 1 Talc
Color	white, gray, brown
Streak	white

Crystal Properties

Property	Value
Crystal structure	triclinic - pinacoidal
Cleavage	perfect
Tenacity	brittle
Fracture	brittle
Luster	pearly

Similar Minerals

Dana Number : 56.02.07.01

Class: 56

Group: 56.02

Subgroup: 56.02.07 - murmanite

Dana Number	Mineral Name	Formula
56.02.07.01	epistolite	(Na,Ca,Fe)2((Na,Ti)4(Nb2(O,H2O)4Si4O14)(OH,F)2)·2(H2O)
56.02.07.02	ferriallanite-(La)	(Ca,La)(Fe+3AlFe+2)(Si2O7)(SiO4)O(OH)
56.02.07.02	murmanite	Na2{(Na,Ti,Nb)4[Ti2(O,H2O)4Si4O14](OH,F)2}
56.02.07.03	shkatulkalite	((Na,Mn,Ca,[])4(Nb2(O,H2O)4Si4O14)(OH,F)2)·2(H2O,[])

Nickel-Strunz Number : 09.BE.30

Group : 09

Subgroup : BE

Nickel-Strunz Number	Mineral Name	Formula
09.BE.30	epistolite	(Na,Ca,Fe)2((Na,Ti)4(Nb2(O,H2O)4Si4O14)(OH,F)2)·2(H2O)

Specimens

Localities

Uses