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Ershovite

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About ErshoviteHide

Formula:
Na4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O
Colour:
Olive-green with brownish or yellowish shades.
Lustre:
Vitreous
Hardness:
2 - 3
Crystal System:
Triclinic
Name:
For Vadim Viktorovich Ershov (1939-1989) of the Moscow Mining Institute.
Fe2+-analogue of paraershovite.


Classification of ErshoviteHide

Approved
Approval Year:
1991
9.DF.15

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
66.6.3.1

66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
6 : Double-Width Unbranched Chains, W=2 with P=2 non-amphibole configuration

Physical Properties of ErshoviteHide

Vitreous
Colour:
Olive-green with brownish or yellowish shades.
Streak:
White
Hardness:
2 - 3 on Mohs scale

Optical Data of ErshoviteHide

Type:
Biaxial (+)
RI values:
nα = 1.569 nβ = 1.574 nγ = 1.590
2V:
Measured: 58° , Calculated: 60°
Max Birefringence:
δ = 0.021
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
medium

Chemical Properties of ErshoviteHide

Formula:
Na4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2O
IMA Formula:
K3Na4(Fe,Mn,Ti)2Si8O20(OH,O)4 · 4H2O
Common Impurities:
Mg,Ca

Crystallography of ErshoviteHide

Crystal System:
Triclinic
Cell Parameters:
a = 10.24 Å, b = 11.92 Å, c = 5.27 Å
α = 103.49°, β = 96.96°, γ = 91.94°
Ratio:
a:b:c = 0.859 : 1 : 0.442
Unit Cell V:
619.62 ų (Calculated from Unit Cell)

Type Occurrence of ErshoviteHide

Synonyms of ErshoviteHide

Other Language Names for ErshoviteHide

German:Ershovit
Spanish:Ershovita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine1 photo of Ershovite associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon. 2/m : B2/b
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1
9.DF.20Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
9.DF.25BaveniteCa4Be2Al2Si9O26(OH)2Orth. mm2
9.DF.30BigcreekiteBaSi2O5 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pnma

Related Minerals - Dana Grouping (8th Ed.)Hide

66.6.3.2ParaershoviteNa3K3Fe3+2Si8O20(OH)4 · 4H2OTric. 1 : P1

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for ErshoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
New Minerals (1997), New Minerals 1990-1994.
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 122(1): 116-120.

Internet Links for ErshoviteHide

Localities for ErshoviteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia (TL)
 
  • Murmansk Oblast
    • Khibiny Massif
      • Koashva Mt
[World of Stones 95:5-6, p64]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Konopleva, N.G., Ivanyuk, G.Y., Pakhomovsky, Y.A., Yakovenchuk, V.N., Men’shikov, Y.P., and Korchak, Y.A. (2008): Geology of Ore Deposits 50(8), 720-731.; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
        • Rasvumchorr Mine
Pekov I.V., Zubkova N.V., Filinchuk Ya.E., Chukanov N.V., Zadov A.E., Pushcharovsky D.Yu., Gobechiya E.R. (2010): Shlykovite, KCa[Si4O9(OH)]·3H2O, and cryptophyllite, K2Ca[Si4O10]·5H2O, two new mineral species from the Khibiny alkaline complex, Kola Peninsula, Russia. Zapiski RMO, 139(1), 37-50.
Mineral and/or Locality  
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