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Ershovite

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Big Photo

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

Show Ershovite Photos (3)



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.


Fe2+-analogue of paraershovite.

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.15Paraershovite
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

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for Ershovite

    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.
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    (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
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