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Ershovite Mineral Data

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General Ershovite Information

Help on Chemical  Formula: Chemical Formula: Na4K3(Fe++,Mn++,Ti)2Si8O20(OH)4•5(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Na4.1K3Fe2+0.9Mn2+0.7Ti0.4Si8O20(OH)4�5(H2O)
Help on Environment: Environment: In hyperagpaitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Mt. Koashva, SE part of the Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Prof. Vadim Viktorovich Ershov (1939-1989) of the Moscow Mining Institute.
Help on Name Pronunciation: Name Pronunciation: Ershovite + Pronunciation Say ERSHOVITE
Help on Synonym: Synonym: ICSD 39449
  PDF 46-1424

Ershovite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =0.8591:1:0.4424
Help on Cell Dimensions: 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
Help on Crystal System: Crystal System: Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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

Help on Cleavage: Cleavage: {100} Perfect, {010} Perfect
Help on Color: Color: Olive green, Brownish green, Yellowish green.
Help on Density: Density: 2.75 - 2.69, Average = 2.72
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Sectile - Curved shavings or scrapings produced by a knife blade, (e.g. graphite).
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Ershovite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): light green or yellowish green.
Help on Pleochroism (y): Pleochroism (y): light green or yellowish green.
Help on Pleochroism (z): Pleochroism (z): dark olive green or dark olive green.

Calculated Properties of Ershovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.71 gm/cc
note: Specific Gravity of Ershovite =2.72 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEErshovite = 4.83 barns/electron
U=PEErshovite x relectron= 13.09 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (66)Inosilicate Double-Width Unbranched Chains, W=2
  (66.01)with P=2 amphibole configuration
  (66.01.05)Dana Group Ershovite Na4K3(Fe,Mn,Ti)2Si8O20(OH)4•5(H2O) P1 1
Help on  Strunz Class: 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

Help on References: References: NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)
Help on See Also: 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

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Dana No: Strunz No: 09.DF.15





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