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Paraershovite

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Formula:
Na3K3Fe3+2Si8O20(OH)4 · 4H2O
Colour:
yellow with orange or pinkish shades
Lustre:
Vitreous
Specific Gravity:
2.60
Crystal System:
Triclinic
Name:
The name paraershovite [from the Greek para (close by) and ershovite] recognizes the close structural and chemical relations between the new mineral and its closest analogue
Fe3+-analogue of ershovite.


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Classification of ParaershoviteHide

Approved
Approval Year:
2009
9.DF.15

9 : SILICATES (Germanates)
D : Inosilicates
F : Inosilicates with 2-periodic multiple chains
66.6.3.2

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

Physical Properties of ParaershoviteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
yellow with orange or pinkish shades
Streak:
White
Tenacity:
Brittle
Cleavage:
Perfect
{100}
Fracture:
Splintery, Step-Like
Density:
2.60(3) g/cm3 (Measured)    2.584 g/cm3 (Calculated)

Optical Data of ParaershoviteHide

Type:
Biaxial (+)
RI values:
nα = 1.569(2) nβ = 1.583(2) nγ = 1.602(2)
2V:
Measured: 80° (3), Calculated: 82°
Max Birefringence:
δ = 0.033
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
dispersion r > v (weak)
Pleochroism:
Non-pleochroic

Chemical Properties of ParaershoviteHide

Formula:
Na3K3Fe3+2Si8O20(OH)4 · 4H2O
IMA Formula:
Na3K3Fe3+2(Si4O10OH)2(OH)2(H2O)4

Crystallography of ParaershoviteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 10.1978(5) Å, b = 12.0155(6) Å, c = 5.2263(3) Å
α = 103.439(1)°, β = 96.020(1)°, γ = 91.683(1)°
Ratio:
a:b:c = 0.849 : 1 : 0.435
Unit Cell V:
618.46 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.778 (100)
4.390 (70)
4.109 (60)
3.390 (50)
3.012 (70)
2.730 (60)
2.606 (70)

Type Occurrence of ParaershoviteHide

General Appearance of Type Material:
equant (100) platy and [001] elongate prismatic crystals up to 0.5–1 mm and aggregates up to 2–3 mm, sporadically scattered
in the pegmatite matrix.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (catalogue number 3793).
Geological Setting of Type Material:
hyperagpaitic pegmatite occurring in ijolite–urtite.
Associated Minerals at Type Locality:

Synonyms of ParaershoviteHide

Related Minerals - Nickel-Strunz GroupingHide

9.DF.05Chesterite(Mg,Fe)17Si20O54(OH)6Orth.
9.DF.05Clinojimthompsonite(Mg,Fe)5Si6O16(OH)2Mon.
9.DF.05Jimthompsonite(Mg,Fe)5Si6O16(OH)2Orth. mmm (2/m 2/m 2/m) : Pbca
9.DF.15ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric.
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

66.6.3.1ErshoviteNa4K3(Fe,Mn,Ti)2Si8O22(OH)4 · 4H2OTric.

Fluorescence of ParaershoviteHide

Other InformationHide

Notes:
Paraershovite readily decomposes at room temperature in a ceramic container with 50% HCl and HNO3 solution
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 ParaershoviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Khomyakov, P., Cámara, F., Sokolova, E., Abdu, Y., Hawthorne, F.C. (2010): Paraershovite, Na3K3Fe3+2Si8O20(OH)4·4H2O, a new mineral species from the Khibina alkaline massif, Kola Peninsula, Russia: mineral description and crystal structure. Canadian Mineralogist, 48, 279-290.

Internet Links for ParaershoviteHide

Localities for ParaershoviteHide

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)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
Khomyakov, P., Cámara, F., Sokolova, E., Abdu, Y., Hawthorne, F.C. (2010): Paraershovite, Na3K3Fe3+2Si8O20(OH)4·4H2O, a new mineral species from the Khibina alkaline massif, Kola Peninsula, Russia: mineral description and crystal structure. Canadian Mineralogist, 48, 279-290.
Mineral and/or Locality  
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