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Ekplexite

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Formula:
(Nb,Mo,W)S2·(Mg1-xAlx)(OH)2+x
Colour:
Iron-black
Lustre:
Metallic
Hardness:
1
Specific Gravity:
3.63 (Calculated)
Crystal System:
Trigonal
Name:
From the Greek έκπληξις ("ekplexis") = surprise, apparently alluding to the surprising combination of elements in its chemical formula.
This page provides mineralogical data about Ekplexite.


Hide all sections | Show all sections

Classification of EkplexiteHide

Approved
Approval Year:
2011

Physical Properties of EkplexiteHide

Metallic
Transparency:
Opaque
Colour:
Iron-black
Hardness:
Tenacity:
Flexible
Cleavage:
Perfect
{001} perfect
Density:
3.63 g/cm3 (Calculated)

Chemical Properties of EkplexiteHide

Formula:
(Nb,Mo,W)S2·(Mg1-xAlx)(OH)2+x
IMA Formula:
(Nb,Mo)S2 · (Mg1-xAlx)(OH)2+x

Crystallography of EkplexiteHide

Crystal System:
Trigonal
Cell Parameters:
a = 3.791(3) Å, c = 11.30(1) Å
Ratio:
a:c = 1 : 2.981
Unit Cell V:
140.64 ų (Calculated from Unit Cell)
Morphology:
Mical-like flakes in aggregates.
Comment:
Space group: P321, P3m1 or P3¯ m1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
11.37(100)
5.65(55)
3.155(4)
2.809(20)
1.623(11)

Type Occurrence of EkplexiteHide

General Appearance of Type Material:
Lenticular nests up to 0.2 mm×1 mm×1 mm consisting of near-parallel, radiating or chaotic aggregates of soft flakes.
Place of Conservation of Type Material:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4155/1
Geological Setting of Type Material:
In perthite-rich fenite, Khibiny alkaline complex, Russia.
Associated Minerals at Type Locality:

Synonyms of EkplexiteHide

Relationship of Ekplexite to other SpeciesHide

Other Members of this group:
FerrotochiliniteFe2+6(Fe2+,Mg)5S6(OH)10Mon.
Ferrovalleriite2(Fe,Cu)S·1.5Fe(OH)2 Trig.
Haapalaite(Fe2+,Ni)2(Mg,Fe2+)1.61S2(OH)3.22Hex.
TochiliniteFe2+5-6(Mg,Fe2+)5S6(OH)10
Valleriite(Fe2+,Cu)4(Mg,Al)3S4(OH,O)6Hex.
Yushkinite(Mg,Al)V4+S2(OH)2Hex.

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 EkplexiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pekov, I.V., Yapaskurt, V.O. and Polekhovsky, Y.S. (2012): Ekplexite, IMA 2011- 082. CNMNC Newsletter No. 12, February 2012, page 152; Mineralogical Magazine, 76,151-155.
Pekov, I.V., Yapaskurt, V.O., Polekhovsky, Y.S., Vigasina, M.F., Siidra, O.I. (2014): Ekplexite (Nb,Mo)S2•(Mg1−xAlx)(OH)2+x, kaskasite (Mo,Nb)S2•(Mg1−xAlx)(OH)2+x and manganokaskasite (Mo,Nb)S2•(Mn1−xAlx)(OH)2+x, three new valleriite-group mineral species from the Khibiny alkaline complex, Kola peninsula, Russia. Mineralogical Magazine, 78, 663-679.

Internet Links for EkplexiteHide

Localities for EkplexiteHide

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
Pekov, I.V., Yapaskurt, V.O. and Polekhovsky, Y.S. (2012): Ekplexite, IMA 2011- 082. CNMNC Newsletter No. 12, February 2012, page 152; Mineralogical Magazine, 76,151-155; Pekov, I.V., Yapaskurt, V.O., Polekhovsky, Y.S., Vigasina, M.F., Siidra, O.I. (2014): Ekplexite (Nb,Mo)S2•(Mg1−xAlx)(OH)2+x, kaskasite (Mo,Nb)S2•(Mg1−xAlx)(OH)2+x and manganokaskasite (Mo,Nb)S2•(Mn1−xAlx)(OH)2+x, three new valleriite-group mineral species from the Khibiny alkaline complex, Kola peninsula, Russia. Mineralogical Magazine, 78, 663-679.
Mineral and/or Locality  
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