Ershovite Mineral Data

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.

Name Pronunciation:

Ershovite + Pronunciation

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),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Rastsvetaeva R K , Rekhlova O Y , Khomyakov A P , Crystallography Reports , 36 (1991) p.500-503, Crystal structure of a new natural Na,K,Fe silicate, Locality: Khibiny massif, Kola peninsula, Russia

Physical Properties of Ershovite

Cleavage:

{100} Perfect, {010} Perfect

Color:

Olive green, Brownish green, Yellowish green.

Density:

2.75 - 2.69, Average = 2.72

Diaphaneity:

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
Ncalc = 1.6 - 1.62

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:

Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Ershovite =2.72 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

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)
Concentration of Ershovite per GRapi unit = 0.61 (%)

Estimated Radioactivity from Ershovite - barely detectable

Ershovite Classification

Dana Class:

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

(66.01)with P=2 amphibole configuration

(66.01.05)Dana Group

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

Strunz Class:

09.DF.15 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DF -Inosilicates with 2-periodic multiple chains

09.DF.15 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)

See Also:

Links to other databases for Ershovite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

Search for Ershovite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Ershovite :

A Bijoux Google Search for Ershovite
Adam's Minerals Google Search for Ershovite
Cape Minerals Google Search for Ershovite
Dakota Matrix Minerals Google Search for Ershovite
Excalibur Mineral Corp. Google Search for Ershovite
Exceptional Minerals Google Search for Ershovite
John Betts Fine Minerals Search for Ershovite
McDougall Minerals Google Search for Ershovite
Mineral News Website Link
Rock and Mineral Shows Google Search for Ershovite
Weinrich Minerals, Inc. Google Search for Ershovite

Ask about Ershovite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Ershovite Specimen Label here :

Ershovite

Na4K3(Fe++,Mn++,Ti)2Si8O20(OH)4•5(H2O)
Dana No: 66.01.05.01 Strunz No: 09.DF.15
Locality:

Notes: