Janchevite
A valid IMA mineral species
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About Janchevite
Formula:
Pb7V5+(O8.5◻0.5)Cl2
Colour:
Orange-red
Lustre:
Adamantine
Hardness:
2½
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.
See also asisite.
Unique Identifiers
Mindat ID:
52591
Long-form identifier:
mindat:1:1:52591:2
GUID
(UUID V4):
(UUID V4):
b707cc2d-67d3-4050-838e-6eba92417e4a
IMA Classification of Janchevite
Approved
IMA Formula:
Pb7V5+(O8.5◻0.5)Cl2
Approval year:
2017
First published:
2018
Classification of Janchevite
3.DB.40
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
B : With Pb, Cu, etc.
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Jan | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Janchevite
Adamantine
Colour:
Orange-red
Streak:
Orange
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct on {001}
Distinct on {001}
Density:
8.160 g/cm3 (Calculated)
Optical Data of Janchevite
Anisotropism:
Weak
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
400nm | 22.28% | 22.87% |
420nm | 21.47% | 22.04% |
440nm | 20.84% | 21.40% |
460nm | 20.31% | 20.80% |
470nm | 20.06% | 20.56% |
480nm | 19.80% | 20.32% |
500nm | 19.47% | 19.89% |
520nm | 19.13% | 19.56% |
540nm | 18.86% | 19.24% |
546nm | 18.81% | 19.20% |
560nm | 18.64% | 19.06% |
580nm | 18.50% | 18.98% |
589nm | 18.59% | 19.06% |
600nm | 18.67% | 19.14% |
620nm | 18.86% | 19.28% |
640nm | 18.90% | 19.35% |
650nm | 18.85% | 19.31% |
660nm | 18.80% | 19.27% |
680nm | 18.64% | 19.09% |
700nm | 18.52% | 18.94% |
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 Janchevite
Mindat Formula:
Pb7V5+(O8.5◻0.5)Cl2
Elements listed:
Crystallography of Janchevite
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 Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Near-surface Processes | |
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) |
Type Occurrence of Janchevite
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:
PbO | 91.64 % |
---|---|
SiO2 | 0.45 % |
V2O5 | 1.95 % |
MoO3 | 2.41 % |
Cl | 4.16 % |
–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 Janchevite
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
3.DB. | Rickturnerite | Pb7O4[Mg(OH)4](OH)Cl3 |
3.DB.05 | Diaboleite | Pb2CuCl2(OH)4 |
3.DB.10 | Pseudoboleite | Pb31Cu24Cl62(OH)48 |
3.DB.15 | Boleite | KPb26Ag9Cu24(OH)48Cl62 |
3.DB.20 | Cumengeite | Pb21Cu20Cl42(OH)40 · 6H2O |
3.DB.25 | Bideauxite | Pb2AgCl3(F,OH)2 |
3.DB.30 | Chloroxiphite | Pb3CuO2Cl2(OH)2 |
3.DB.35 | Hematophanite | Pb4Fe3O8(OH,Cl) |
3.DB.40 | Asisite | Pb7SiO9Cl2 |
3.DB.40 | Parkinsonite | Pb7MoO9Cl2 |
3.DB.45 | Murdochite | PbCu6O8-x(Cl,Br)2x |
3.DB.45 | Eddavidite | Pb2Cu12O15Br2 |
3.DB.50 | Yedlinite | Pb6Cr3+Cl6(O,OH,H2O)8 |
3.DB.55 | Siidraite | Pb2Cu(OH)2I3 |
Other Information
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 Janchevite
mindat.org URL:
https://www.mindat.org/min-52591.html
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Please feel free to link to this page.
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References for Janchevite
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2017) New minerals and nomenclature modifications approved in 2017, CNMNC Newsletter No 40. Mineralogical Magazine, 81 (6) 1577-1581 doi:10.1180/minmag.2017.081.096p.1579
Localities for Janchevite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Namibia (TL) | |
| Mineralogical Magazine: 81: 1577–1581 +2 other references |
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Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia