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Janchevite

A valid IMA mineral species
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About JancheviteHide

Formula:
Pb7V5+(O8.50.5)Cl2
Colour:
Orange-red
Lustre:
Adamantine
Hardness:
Specific Gravity:
8.160 (Calculated)
Crystal System:
Tetragonal
Name:
Named in honor of the Simeon Jančev (b. 1942), mineralogist and professor, Faculty of Technology and Metallurgy, Saints Cyril and Methodius University, Skopje, Macedonia.
The V-dominant analogue of parkinsonite. Chemically related to erikjonssonite, hereroite, kombatite, and vanadinite.

See also asisite.


Unique IdentifiersHide

Mindat ID:
52591
Long-form identifier:
mindat:1:1:52591:2
GUID
(UUID V4):
b707cc2d-67d3-4050-838e-6eba92417e4a

IMA Classification of JancheviteHide

Classification of JancheviteHide

3.DB.40

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
JanIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of JancheviteHide

Adamantine
Colour:
Orange-red
Streak:
Orange
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {001}
Density:
8.160 g/cm3 (Calculated)

Optical Data of JancheviteHide

Anisotropism:
Weak
Reflectivity:
WavelengthR1R2
400nm22.28%22.87%
420nm21.47%22.04%
440nm20.84%21.40%
460nm20.31%20.80%
470nm20.06%20.56%
480nm19.80%20.32%
500nm19.47%19.89%
520nm19.13%19.56%
540nm18.86%19.24%
546nm18.81%19.20%
560nm18.64%19.06%
580nm18.50%18.98%
589nm18.59%19.06%
600nm18.67%19.14%
620nm18.86%19.28%
640nm18.90%19.35%
650nm18.85%19.31%
660nm18.80%19.27%
680nm18.64%19.09%
700nm18.52%18.94%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 22.87%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Light gray
Internal Reflections:
Deep red

Chemistry of JancheviteHide

Mindat Formula:
Pb7V5+(O8.50.5)Cl2

Crystallography of JancheviteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I4/mmm
Setting:
I4/mmm
Cell Parameters:
a = 3.9591(5) Å, c = 22.6897(3) Å
Ratio:
a:c = 1 : 5.731
Unit Cell V:
355.65 ų
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.889 Å(24)
3.501 Å(31)
2.979 Å(86)
2.833 Å(25)
2.794 Å(100)
1.992 Å(26)
1.988 Å(49)
1.649 Å(46)
Comments:
From Type Description.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)

Type Occurrence of JancheviteHide

General Appearance of Type Material:
Orange-red thick tabular anhedral to subhedral grains up to 0.8 mm in size.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, registration number 5105/1.
Empirical Formula of Type Material:
Pb7.20V5+0.38Mo6+0.29Si0.13Cl2.06O8.25
Chemical Analysis of Type Material:
PbO91.64 %
SiO20.45 %
V2O51.95 %
MoO32.41 %
Cl4.16 %
–O=Cl-0.94 %
Total:99.67 %
Geological Setting of Type Material:
Metamorphism of a primary, Pb-Mn-(As-Ba)-rich, chemically heterogeneous, volcanic hydrothermal assemblage.
Associated Minerals at Type Locality:
Reference:
Chukanov, N.V., Nekrasova, D.O., Siidra, O.I., Polekhovsky, Yu.S., Pekov, I.V. (2018) Janchevite, Pb7V5+(O8.5□0.5)Cl2, a new mineral from Kombat mine, Namibia. Canadian Mineralogist: 56: 159-165.

Synonyms of JancheviteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
11 photos of Janchevite associated with HausmanniteMn2+Mn3+2O4
5 photos of Janchevite associated with BaryteBaSO4
1 photo of Janchevite associated with CopperCu

Related Minerals - Strunz-mindat GroupingHide

3.DB.RickturneritePb7O4[Mg(OH)4](OH)Cl3Orth. mmm (2/m 2/m 2/m) : Pnma
3.DB.05DiaboleitePb2CuCl2(OH)4Tet. 4mm : P4mm
3.DB.10PseudoboleitePb31Cu24Cl62(OH)48Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.15BoleiteKPb26Ag9Cu24(OH)48Cl62Iso. m3m (4/m 3 2/m) : Pm3m
3.DB.20CumengeitePb21Cu20Cl42(OH)40 · 6H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.25BideauxitePb2AgCl3(F,OH)2Iso. m3m (4/m 3 2/m) : Fd3m
3.DB.30ChloroxiphitePb3CuO2Cl2(OH)2Mon. 2/m : P21/m
3.DB.35HematophanitePb4Fe3O8(OH,Cl)Tet. 4mm : P4mm
3.DB.40AsisitePb7SiO9Cl2 Tet. 4/mmm (4/m 2/m 2/m) : I4/mmm
3.DB.40ParkinsonitePb7MoO9Cl2 Tet.
3.DB.45MurdochitePbCu6O8-x(Cl,Br)2xIso. m3m (4/m 3 2/m) : Fm3m
3.DB.45EddaviditePb2Cu12O15Br2Iso. m3m (4/m 3 2/m) : Fm3m
3.DB.50YedlinitePb6Cr3+Cl6(O,OH,H2O)8Trig. 3 : R3
3.DB.55SiidraitePb2Cu(OH)2I3Orth. mmm (2/m 2/m 2/m) : Fddd

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.

Internet Links for JancheviteHide

References for JancheviteHide

Localities for JancheviteHide

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 references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Namibia (TL)
 
  • Otjozondjupa Region
    • Otavi Constituency
      • Kombat
Mineralogical Magazine: 81: 1577–1581 +2 other references
 
Mineral and/or Locality  
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