Janchevite
A valid IMA mineral species
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About Janchevite
Formula:
Pb9V5+(O10.25◻0.75)Cl2.5
Colour:
Orange-red
Lustre:
Adamantine
Hardness:
2½
Specific Gravity:
8.160 (Calculated)
Crystal System:
Triclinic
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
IMA Classification of Janchevite
Approved
IMA Formula:
Pb2+9V5+O10.25◻0.75Cl2.5
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 for Standard |
|---|---|---|
| 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). 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:
Pb9V5+(O10.25◻0.75)Cl2.5
Element Weights:
Elements listed:
Crystallography of Janchevite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 8.8382(7) Å, b = 8.8567(7) Å, c = 11.7103(17) Å
α = 103.385(10)°, β = 94.192(10)°, γ = 90.294(6)°
α = 103.385(10)°, β = 94.192(10)°, γ = 90.294(6)°
Ratio:
a:b:c = 0.998 : 1 : 1.322
Unit Cell V:
889.13 ų
Z:
2
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) |
Reference:
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:
Synonyms of Janchevite
Other Language Names for Janchevite
Dutch:Jancheviet
German:Janchevit
Common Associates
Associations Based on Photo Data:
| 12 photos of Janchevite associated with Hausmannite | Mn2+Mn3+2O4 |
| 5 photos of Janchevite associated with Baryte | BaSO4 |
| 1 photo of Janchevite associated with Kombatite | Pb14(VO4)2O9Cl4 |
| 1 photo of Janchevite associated with Native Copper | Cu |
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 | Parkinsonite | Pb7MoO9Cl2 |
| 3.DB.40 | Asisite | Pb7SiO9Cl2 |
| 3.DB.45 | Eddavidite | Cu12Pb2O15Br2 |
| 3.DB.45 | Murdochite | Cu12Pb2O15Cl2 |
| 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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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
Showing 1 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Namibia (TL) | |
| Hålenius et al. (2017) +3 other references |
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Kombat Mine, Kombat, Otavi Constituency, Otjozondjupa Region, Namibia