Pandoraite-Ba
A valid IMA mineral species
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About Pandoraite-Ba
Formula:
BaV4+5V5+2O16 · 3H2O
Colour:
Dark blue
Lustre:
Vitreous
Hardness:
2½
Specific Gravity:
3.24
Crystal System:
Monoclinic
Name:
Named after the type locality.
Isostructural with:
A vanadium-oxide-bronze mineral. Found as a secondary mineral in a matrix consisting of recrystallized quartz grains from the original sandstone.
Known synthetic analogue.
Known synthetic analogue.
Unique Identifiers
Mindat ID:
52993
Long-form identifier:
mindat:1:1:52993:6
GUID
(UUID V4):
(UUID V4):
5ac614a9-d091-4ceb-8562-43053683c67b
IMA Classification of Pandoraite-Ba
Approved
Approval year:
2018
First published:
2019
Type description reference:
Kampf, Anthony R., Hughes, John M., Nash, Barbara P., Marty, Joe (2019) Pandoraite-Ba and pandoraite-Ca, Ba(V4+5V5+2)O16·3H2O and Ca(V4+5V5+2)O16·3H2O, two new vanadium oxide bronze minerals in solid solution from the Pandora Mine, La Sal Mining District, San Juan County, Colorado, USA. The Canadian Mineralogist, 57 (2) 255-265 doi:10.3749/canmin.1800063
Classification of Pandoraite-Ba
4.HG.70
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
G : Unclassified V oxides
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 |
|---|---|---|
| Pdo-Ba | 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 Pandoraite-Ba
Vitreous
Transparency:
Transparent
Colour:
Dark blue
Streak:
Light greenish blue
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {001}
on {001}
Density:
3.24 g/cm3 (Measured)
Optical Data of Pandoraite-Ba
Type:
Biaxial (-)
RI values:
nα = 1.810(2) nβ = 1.840(1) nω = 1.840(1) nε = 1.810(2)
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Visible
Comments:
Greenish-blue pleochroism, Y and Z (O) > X (E).
Chemistry of Pandoraite-Ba
Mindat Formula:
BaV4+5V5+2O16 · 3H2O
Elements listed:
Crystallography of Pandoraite-Ba
Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
P2
Setting:
P2
Cell Parameters:
a = 6.154(2) Å, b = 6.153(2) Å, c = 21.356(7) Å
β = 90.058(9)°
β = 90.058(9)°
Ratio:
a:b:c = 1 : 1 : 3.471
Unit Cell V:
808.66 ų (Calculated from Unit Cell)
Morphology:
Square plates up to approximately 100 μm across. Plates occur in subparallel to random intergrowths.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.9 Å | (100) |
| 5.41 Å | (12) |
| 3.631 Å | (18) |
| 2.812 Å | (19) |
| 2.739 Å | (20) |
| 2.559 Å | (26) |
| 2.176 Å | (13) |
| 1.934 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] | |
| 47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Pandoraite-Ba
General Appearance of Type Material:
Thin, dark blue, square plates up to approximately 100 μm across and approximately 2 μm thick, on a matrix consisting of recrystallized quartz grains from the original sandstone
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 67293 and 67294
Associated Minerals at Type Locality:
Reference:
Kampf, A.R., Hughes, J.M., Nash, B.P., Marty, J. (2019): Pandoraite-Ba and Pandoraite-Ca, Ba(V4+5V5+2)O16·3H2O and Ca(V4+5V5+2)O16·3H2O, Two New Vanadium Oxide Bronze Minerals in Solid Solution from the Pandora Mine, La Sal Mining District, San Juan County, Colorado, USA. The Canadian Mineralogist: 5: 255-265.
Synonyms of Pandoraite-Ba
Common Associates
Associated Minerals Based on Photo Data:
| 3 photos of Pandoraite-Ba associated with Francevillite | Ba(UO2)2(VO4)2 · 5H2O |
| 1 photo of Pandoraite-Ba associated with Pascoite | Ca2Ca(V10O28) · 17H2O |
| 1 photo of Pandoraite-Ba associated with Quartz | SiO2 |
| 1 photo of Pandoraite-Ba associated with Finchite | Sr(UO2)2(V2O8) · 5H2O |
| 1 photo of Pandoraite-Ba associated with Sandstone | |
| 1 photo of Pandoraite-Ba associated with Pandoraite-Ca | CaV4+5V5+2O16 · 3H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HG. | Calciodelrioite | Ca(VO3)2 · 4H2O |
| 4.HG. | Trebiskyite | Na3Mg2[TiV9O28] · 22H2O |
| 4.HG.05 | Fervanite | Fe3+4V5+4O16 · 5H2O |
| 4.HG.10 | Huemulite | Na4Mg(V10O28) · 24H2O |
| 4.HG.15 | Vanalite | NaAl8V10O38 · 30H2O |
| 4.HG.20 | Simplotite | CaV4+4O9 · 5H2O |
| 4.HG.25 | Vanoxite | V4+4V5+2O13 · 8H2O |
| 4.HG.30 | Navajoite | Fe3+V5+9O24 · 12H2O |
| 4.HG.35 | Delrioite | CaSr(V2O6)(OH)2 · 3H2O |
| 4.HG.40 | Metadelrioite | CaSr(V2O6)(OH)2 |
| 4.HG.45 | Barnesite | (Na,Ca)V6O16 · 3H2O |
| 4.HG.50 | Hendersonite | (Ca,Sr)1.3V6O16 · 6H2O |
| 4.HG.55 | Grantsite | (Na,Ca)2+x(V5+,V4+)6O16 · 4H2O |
| 4.HG.60 | Lenoblite | V4+2O4 · 2H2O |
| 4.HG.65 | Satpaevite | Al12V4+2V5+6O37 · 30H2O |
| 4.HG.70 | Pandoraite-Ca | CaV4+5V5+2O16 · 3H2O |
Fluorescence of Pandoraite-Ba
Displays no fluorescence
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 Pandoraite-Ba
mindat.org URL:
https://www.mindat.org/min-52993.html
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Please feel free to link to this page.
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External Links:
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References for Pandoraite-Ba
Reference List:
Hålenius, U., Hatert, F., Pasero, M., Mills, S. J. (2018) CNMNC Newsletter No. 44, New minerals and nomenclature modifications approved in 2018. Mineralogical Magazine, 82 (4) 1015-1021 doi:10.1180/mgm.2018.148p.1017
Kampf, Anthony R., Hughes, John M., Nash, Barbara P., Marty, Joe (2019) Pandoraite-Ba and pandoraite-Ca, Ba(V4+5V5+2)O16·3H2O and Ca(V4+5V5+2)O16·3H2O, two new vanadium oxide bronze minerals in solid solution from the Pandora Mine, La Sal Mining District, San Juan County, Colorado, USA. The Canadian Mineralogist, 57 (2) 255-265 doi:10.3749/canmin.1800063
Localities for Pandoraite-Ba
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.
USA (TL) | |
| Hålenius et al. (2018) +1 other reference |
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Pandora Mine, La Sal Mining District, San Juan County, Utah, USA