Ershovite Mineral Data

Ershovite Mineral Data +

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General Ershovite Information

Chemical Formula:

Na4K3(Fe++,Mn++,Ti)2Si8O20(OH)4·5(H2O)

Composition:

Molecular Weight = 1,022.20 gm

Potassium 11.47 % K 13.82 % K₂O

Sodium 9.22 % Na 12.43 % Na₂O

Titanium 1.87 % Ti 3.13 % TiO₂

Manganese 3.76 % Mn 4.86 % MnO

Iron 4.92 % Fe 6.33 % FeO

Silicon 21.98 % Si 47.02 % SiO₂

Hydrogen 1.38 % H 12.34 % H₂O

Oxygen 45.39 % O

______ ______

100.00 % 99.92 % = TOTAL OXIDE

Empirical Formula:

Na_4.1K₃Fe²⁺_0.9Mn²⁺_0.7Ti_0.4Si₈O₂₀(OH)₄·5(H₂O)

Environment:

In hyperagpaitic pegmatites.

IMA Status:

Approved IMA 1993

Locality:

Mt. Koashva, SE part of the Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named after Prof. Vadim Viktorovich Ershov (1939-1989) of the Moscow Mining Institute.

Synonym:

ICSD 39449

IMA1991-014

PDF 46-1424

Ershovite Image

Images:

Ershovite

Comments: Olive green coatings of ershovite on green aegirine.
Location: Mount Koashva, Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ershovite Crystallography

Axial Ratios:

a:b:c =0.8591:1:0.4424

Cell Dimensions:

a = 10.244, b = 11.924, c = 5.276, Z = 1; alpha = 103.136°, beta = 96.033°, gamma = 91.033° V = 624.02 Den(Calc)= 2.72

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 11.58(1), 2.99(1), 1.652(0.8),2.709(0.8), 2.608(0.7), 2.16(0.6), 2.459(0.6),

Physical Properties of Ershovite

Cleavage:

[100] Perfect, [010] Perfect

Color:

Olive green, Brownish green, Yellowish green.

Density:

2.75 - 2.69, Average = 2.72

Diaphaniety:

Transparent

Fracture:

Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ershovite

Gladstone-Dale:

CI meas= 0.053 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.053 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2124,KPDmeas= 0.2124,KC= 0.2242

Optical Data:

Biaxial (+), a=1.569, b=1.574, g=1.59, bire=0.0210, 2V(Calc)=60, 2V(Meas)=58. Dispersion medium, r > v.

Pleochroism (x):

light green or yellowish green.

Pleochroism (y):

light green or yellowish green.

Pleochroism (z):

dark olive green or dark olive green.

Calculated Properties of Ershovite

Electron Density:

r_electron=2.71 gm/cc
note: r_Ershovite=2.72 gm/cc.

Fermion Index

Fermion Index = 0.01396
Boson Index = 0.98604

Photoelectric:

PE_Ershovite= 4.83 barns/electron
U=PE_Ershovite x r_electron= 13.09 barns/cc.

Radioactivity:

GRapi = 165.15 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Ershovite - barely detectable

Ershovite Classification

Dana Class:

66.1.5.1 (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.1)Dana Type

(66.1.5)Dana Group

66.1.5.1 Ershovite Na4K3(Fe,Mn,Ti)2Si8O20(OH)4·5(H2O) P1 1

Strunz Class:

VIII/H.04-30 VIII - Silicates

VIII/H - Phyllosilicates (layered), Tetragonal or pseudotetragonal layered structures [Si4O10]4- and others

VIII/H.04 - Fenaksite series

VIII/H.04-10 Fenaksite (K,Na,Ca)4(Fe,Fe,Mn)2Si8O20(OH,F) P1 1

VIII/H.04-20 Manaksite KNaMnSi4O10 P1 1

VIII/H.04-30 Ershovite Na4K3(Fe,Mn,Ti)2Si8O20(OH)4·5(H2O) P1 1

Other Ershovite Information

References:

NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)

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Ershovite

Na4K3(Fe++,Mn++,Ti)2Si8O20(OH)4·5(H2O)
Dana No: 66.1.5.1 Strunz No: VIII/H.04-30
Locality:

Notes: