Fulbrightite
A valid IMA mineral species
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About Fulbrightite
Formula:
Ca(V4+O)2(As5+O4)2 · 4H2O
Colour:
Typically pale to bright green. Less commonly yellow, orange, or pale blue.
Lustre:
Vitreous, Pearly
Hardness:
2½
Specific Gravity:
3.12
Crystal System:
Triclinic
Member of:
Name:
Named in honor of Jess W. Fulbright Jr. (1958-), of Nucla, Colorado, Safety Director for Energy Fuels Inc., a company involved in the acquisition, exploration, development and mining of uranium properties in the western USA. He provided mine access and logistical support for the scientific study and collecting of secondary uranium and vanadium minerals in deposits in the Uravan Mineral Belt.
Isostructural with:
The arsenate analogue of sincosite. First natural vanadyl arsenate. Structurally related to the meta-autunite group.
Isostructural with triclinic sincosite, structurally related through polytypism with bariosincosite and airdite.
Isostructural with triclinic sincosite, structurally related through polytypism with bariosincosite and airdite.
Unique Identifiers
Mindat ID:
53867
Long-form identifier:
mindat:1:1:53867:9
Classification of Fulbrightite
Sincosite-type sheet
The sincosite-type sheet found in fulbrightite. In fulbrightite, the T site is occupied by arsenic.
IMA Classification of Fulbrightite
Approved
IMA Formula:
Ca(V4+O)2(As5+O4)2·4H2O
Approval year:
2019
First published:
2020
Type description reference:
8.CJ.35
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
J : With only large cations
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 |
|---|---|---|
| Fbg | 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 Fulbrightite
Vitreous, Pearly
Colour:
Typically pale to bright green. Less commonly yellow, orange, or pale blue.
Streak:
Colorless to pale green
Hardness:
2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
(001) perfect, (100) and (010) excellent, (110) and (110) fair
(001) perfect, (100) and (010) excellent, (110) and (110) fair
Fracture:
Irregular/Uneven, Step-Like
Comment:
Brittle, but slightly flexible in thin plates.
Fracture is stepped, irregular, and curved.
Fracture is stepped, irregular, and curved.
Density:
3.12(2) g/cm3 (Measured)
Optical Data of Fulbrightite
Type:
Biaxial (-)
RI values:
nα = 1.675(3) nβ = 1.718(3) nγ = 1.718(3)
2V:
Measured: 5°
Max. Birefringence:
δ = 0.043
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
X colorless, Y and Z pale green (X < Y = Z)
Chemistry of Fulbrightite
Mindat Formula:
Ca(V4+O)2(As5+O4)2 · 4H2O
Element Weights:
Crystallography of Fulbrightite
Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 6.434(8) Å, b = 6.480(8) Å, c = 6.718(8) Å
α = 107.90(6)°, β = 94.06(4)°, γ = 90.06(3)°
α = 107.90(6)°, β = 94.06(4)°, γ = 90.06(3)°
Ratio:
a:b:c = 0.993 : 1 : 1.037
Unit Cell V:
265.8 ų
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 6.51 Å | (52) |
| 3.221 Å | (100) |
| 3.085 Å | (16) |
| 2.893 Å | (15) |
| 2.823 Å | (12) |
| 2.277 Å | (23) |
| 1.619 Å | (20) |
| 1.450 Å | (21) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Fulbrightite
General Appearance of Type Material:
Rosettes of roughly square (pseudotetragonal) plates.
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 64513, 65555 and 65559.
Synonyms of Fulbrightite
Other Language Names for Fulbrightite
Dutch:Fulbrightiet
German:Fulbrightit
Relationship of Fulbrightite to other Species
Member of:
Other Members of Sincosite Group:
| Airdite | Sr(V4+O)2(PO4)2 · 4H2O | Mon. m : Bb |
| Bariosincosite | Ba(V4+O)2(PO4)2 · 4H2O | Tet. |
| Sincosite | Ca(V4+O)2(PO4)2 · 4H2O | Tet. 4/mmm(4/m2/m2/m) : P42/nnm |
Common Associates
Associations Based on Photo Data:
| 2 photos of Fulbrightite associated with Vanarsite | NaCa12(As3+V5+8.5V4+3.5As5+6O51)2 · 78H2O |
| 1 photo of Fulbrightite associated with Zincocabrerite | ZnMg2(AsO4)2(H2O)8 |
| 1 photo of Fulbrightite associated with Packratite | Ca11(As3+V5+10V4+2As5+6O51)2 · 83H2O |
Related Minerals - Strunz-mindat Grouping
| 8.CJ. | Airdite | Sr(V4+O)2(PO4)2 · 4H2O |
| 8.CJ. | Dobšináite | Ca2Ca(AsO4)2 · 2H2O |
| 8.CJ. | Sainfeldite | Ca5(AsO4)2(AsO3OH)2 · 4H2O |
| 8.CJ. | Caesiumpharmacosiderite | CsFe3+4[(AsO4)3(OH)4] · 4H2O |
| 8.CJ. | Jeankempite | Ca5(AsO4)2(HAsO4)2 · 7H2O |
| 8.CJ.05 | Stercorite | (NH4)Na(PO3OH) · 4H2O |
| 8.CJ.10 | Swaknoite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.10 | Mundrabillaite | (NH4)2Ca(PO3OH)2 · H2O |
| 8.CJ.15 | Nabaphite | NaBaPO4 · 9H2O |
| 8.CJ.15 | Nastrophite | Na(Sr,Ba)PO4 · 9H2O |
| 8.CJ.20 | Haidingerite | CaHAsO4 · H2O |
| 8.CJ.25 | Rhabdophane-(Y) | YPO4 · H2O |
| 8.CJ.25 | Vladimirite | Ca4(AsO4)2(AsO3OH) · 4H2O |
| 8.CJ.27 | 'Churchite-(Dy)' | (Dy,Sm,Gd,Nd)PO4 · 2H2O |
| 8.CJ.30 | Ferrarisite | Ca5(AsO4)2(HAsO4)2 · 9H2O |
| 8.CJ.35 | Machatschkiite | (Ca,Na)6(AsO4)(HAsO4)3(PO4,SO4) · 15H2O |
| 8.CJ.40 | Rauenthalite | Ca3(AsO4)2 · 10H2O |
| 8.CJ.40 | Phaunouxite | Ca3(AsO4)2 · 11H2O |
| 8.CJ.45 | Brockite | (Ca,Th,Ce)PO4 · H2O |
| 8.CJ.45 | Smirnovskite | (Th,Ca)PO4 · nH2O |
| 8.CJ.45 | Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 8.CJ.45 | Rhabdophane-(La) | La(PO4) · H2O |
| 8.CJ.45 | Rhabdophane-(Nd) | Nd(PO4) · H2O |
| 8.CJ.45 | Tristramite | (Ca,U4+,Fe3+)(PO4,SO4) · 2H2O |
| 8.CJ.45 | Grayite | (Th,Pb,Ca)(PO4) · H2O |
| 8.CJ.45 | Štěpite | U(AsO3OH)2 · 4H2O |
| 8.CJ.47 | Vysokýite | U4+[AsO2(OH)2]4 · 4H2O |
| 8.CJ.50 | Churchite-(Y) | Y(PO4) · 2H2O |
| 8.CJ.50 | Brushite | Ca(PO3OH) · 2H2O |
| 8.CJ.50 | Ardealite | Ca2(PO3OH)(SO4) · 4H2O |
| 8.CJ.50 | Pharmacolite | Ca(HAsO4) · 2H2O |
| 8.CJ.50 | 'Churchite-(Nd)' | Nd(PO4) · 2H2O |
| 8.CJ.55 | Mcnearite | NaCa5(AsO4)(HAsO4)4 · 4H2O |
| 8.CJ.60 | Dorfmanite | Na2(PO3OH) · 2H2O |
| 8.CJ.65 | Sincosite | Ca(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.65 | Bariosincosite | Ba(V4+O)2(PO4)2 · 4H2O |
| 8.CJ.70 | Catalanoite | Na2(PO3OH) · 8H2O |
| 8.CJ.75 | Guérinite | Ca6(HAsO4)3(AsO4)2 · 10.5H2O |
| 8.CJ.85 | Ningyoite | (U,Ca,Ce)2(PO4)2 · 1-2H2O |
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 Fulbrightite
mindat.org URL:
https://www.mindat.org/min-53867.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Fulbrightite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 51. European Journal of Mineralogy, 31 (5-6) 1099-1104 doi:10.1127/ejm/2019/0031-2894
Localities for Fulbrightite
Showing 4 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.
Czech Republic | |
| Jan Hloušek Collection |
USA | |
| Carnegie Museum of Natural History ... |
| Collected by Al Wilkins | |
| Miyawaki et al. (2019) +2 other references |
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Packrat Mine, Beaver Mesa, Gateway Mining District, Mesa County, Colorado, USA