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Janchevite

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About JancheviteHide

Formula:
Pb7V5+(O8.50.5)Cl2
Colour:
Orange-red
Lustre:
Adamantine
Hardness:
Specific Gravity:
8.16 (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.


Classification of JancheviteHide

Approved
Approval Year:
2017
First Published:
2018

Physical Properties of JancheviteHide

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

Chemical Properties of JancheviteHide

Formula:
Pb7V5+(O8.50.5)Cl2
IMA 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
3.889Å(24)
3.501Å(31)
2.979Å(86)
2.833Å(25)
2.794Å(100)
1.992Å(26)
1.988Å(49)
1.649Å(46)
Comments:
From Type Description.

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 %
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

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 JancheviteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Nekrasova, D.O., Siidra, O.I., Polekhovsky, Y.S. and Pekov, I.V. (2017) Janchevite, IMA 2017-079. CNMNC Newsletter No. 40, December 2017, page 1581; Mineralogical Magazine: 81: 1577–1581.
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.

Internet Links 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 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.
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein
      • Kombat
Chukanov, N.V., Nekrasova, D.O., Siidra, O.I., Polekhovsky, Y.S. and Pekov, I.V. (2017) Janchevite, IMA 2017-079. CNMNC Newsletter No. 40, December 2017, page 1581; Mineralogical Magazine: 81: 1577–1581; 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.
 
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