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Ershovite

Big Photo

Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Peter Kohorst

Formula:
Na
 
4
K
 
3
(Fe,Mn,Ti)
 
2
Si
 
8
O
 
22
(OH)
 
4
·4H
 
2
O
System:TriclinicColour:Olive-green with ...
Lustre:VitreousHardness:2 - 3
Name:For Vadim Viktorovich Ershov (1939-1989) of the Moscow Mining Institute.
This page provides mineralogical data about Ershovite.

Classification of Ershovite

IMA status:Approved 1991
Strunz 8th edition ID:8/H.04-30
Nickel-Strunz 10th (pending) edition ID:9.DF.15

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
Dana 8th edition ID: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
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Type Occurrence of Ershovite

Co-type Localities:Koashva Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia

Physical Properties of Ershovite

Lustre:Vitreous
Colour:Olive-green with brownish or yellowish shades.
Streak:White
Hardness (Mohs):2 - 3

Crystallography of Ershovite

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

Optical Data of Ershovite

Type:Biaxial (+)
RI values: nα = 1.569 nβ = 1.574 nγ = 1.590
2V:Measured: 58° , Calculated: 60°
Maximum Birefringence:δ = 0.021

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Dispersion:medium

Chemical Properties of Ershovite

Formula:
Na
 
4
K
 
3
(Fe,Mn,Ti)
 
2
Si
 
8
O
 
22
(OH)
 
4
·4H
 
2
O
Essential elements:Fe, H, K, Na, O, Si
All elements listed in formula:Fe, H, K, Mn, Na, O, Si, Ti
Common Impurities:Mg,Ca

Relationship of Ershovite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.DF.05Chesterite
(Mg,Fe)
 
17
Si
 
20
O
 
54
(OH)
 
6
9.DF.05Clinojimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.05Jimthompsonite
(Mg,Fe)
 
5
Si
 
6
O
 
16
(OH)
 
2
9.DF.15IMA2009-025
Na
 
3
K
 
3
Fe
3+
2
Si
 
8
O
 
20
(OH)
 
4
·4H
 
2
O
9.DF.20Tvedalite
(Ca,Mn)
 
4
Be
 
3
Si
 
6
O
 
17
(OH)
 
4
·3H
 
2
O
9.DF.25Bavenite
Ca
 
4
Be
 
2
Al
 
2
Si
 
9
O
 
26
(OH)
 
2
9.DF.30Bigcreekite
BaSi
 
2
O
 
5
·4H
 
2
O

Other Names for Ershovite

Synonyms:
IMA1991-014
Other Languages:
German:Ershovit
Russian:Ершовит
Spanish:Ershovita

Other Information

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

References for Ershovite

Reference List:New Minerals (1997), New Minerals 1990-1994.

Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 122(1): 116-120.

Internet Links for Ershovite

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  • Raman and XRD data at RRUFF project
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  • Ershovite details from Handbook of Mineralogy (PDF)
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    Localities for Ershovite

    Hide Locality List
    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Khibiny Massif
    		[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
    Mineral and/or Locality
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 18th Nov 2009 02:48:41