Davidbrownite-(NH4)
A valid IMA mineral species
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About Davidbrownite-(NH4)
Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O
Colour:
Light green-blue
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.12
Crystal System:
Monoclinic
Name:
Named in honor of I. David Brown (b. 11 April 1932, Edgeware, Middlesex, UK) British-Canadian crystallographer and professor at McMaster University, Hamilton, Ontario, Canada. Dr. Brown is well known for developing Bond-Valence Theory used by mineralogical crystallographers worldwide.
New structure type. Unique combination of elements (compare rowleyite, though). Chemically somewhat similar to thebaite-(NH4), relianceite-(NH4) and dendoraite-(K): other oxalate-phosphate minerals. The first vanadium-bearing oxalate mineral (compare relianceite-(K)). The first approved organic vanadium mineral.
Name Encoding
Formatted:
davidbrownite-(NH4)
HTML:
davidbrownite-(NH<sub>4</sub>)
LaTeX:
davidbrownite-(NH\$\_4\$)
Unique Identifiers
Mindat ID:
53370
Long-form identifier:
mindat:1:1:53370:8
IMA Classification of Davidbrownite-(NH4)
Approved
IMA Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O
Approval year:
2019
First published:
2019
Type description reference:
Kampf, Anthony R., Cooper, Mark A., Rossman, George R., Nash, Barbara P., Hawthorne, Frank. C., Marty, Joe (2019) Davidbrownite-(NH4), (NH4,K)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O, a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA. Mineralogical Magazine, 83 (6) 869-877 doi:10.1180/mgm.2019.56
Classification of Davidbrownite-(NH4)
8.DG.
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
G : With large and medium-sized cations, (OH, etc.):RO4< 0.5:1
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 |
|---|---|---|
| Dbn-NH4 | 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 Davidbrownite-(NH4)
Vitreous
Colour:
Light green-blue
Streak:
White
Hardness:
2 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Probably {100} and {001}
Probably {100} and {001}
Fracture:
Splintery
Density:
2.12(2) g/cm3 (Measured)
Optical Data of Davidbrownite-(NH4)
Type:
Biaxial (+)
RI values:
nα = 1.540(2) nβ = 1.550(5) nγ = 1.582(2)
2V:
Measured: 58.5° (5)
Max. Birefringence:
δ = 0.042
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
Dispersion:
moderate, r>v
Pleochroism:
Visible
Comments:
X = pale blue, Y = nearly colorless, Z = lightblue; Y
Comments:
Z=b,Y≈a
Chemistry of Davidbrownite-(NH4)
Mindat Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O
Element Weights:
Crystallography of Davidbrownite-(NH4)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 10.356(6) Å, b = 8.923(5) Å, c = 13.486(7) Å
β = 92.618(9)°
β = 92.618(9)°
Ratio:
a:b:c = 1.161 : 1 : 1.511
Unit Cell V:
1244.9 ų
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.39 Å | (100) |
| 6.73 Å | (50) |
| 5.97 Å | (34) |
| 3.789 Å | (35) |
| 3.160 Å | (47) |
| 3.104 Å | (42) |
| 3.043 Å | (35) |
| 2.977 Å | (44) |
Reference:
Kampf, Anthony R., Cooper, Mark A., Rossman, George R., Nash, Barbara P., Hawthorne, Frank. C., Marty, Joe (2019) Davidbrownite-(NH4), (NH4,K)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O, a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA. Mineralogical Magazine, 83 (6) 869-877 doi:10.1180/mgm.2019.56
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 52 : Guano- and urine-derived minerals | <0.4 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Davidbrownite-(NH4)
General Appearance of Type Material:
Needles or narrow blades up to about 0.2 mm in length
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 66951, 66955 and 66959 (cotypes)
Geological Setting of Type Material:
Bat-guano-related, post-mining assemblage
Associated Minerals at Type Locality:
Reference:
Kampf, Anthony R., Cooper, Mark A., Rossman, George R., Nash, Barbara P., Hawthorne, Frank. C., Marty, Joe (2019) Davidbrownite-(NH4), (NH4,K)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O, a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA. Mineralogical Magazine, 83 (6) 869-877 doi:10.1180/mgm.2019.56
Synonyms of Davidbrownite-(NH4)
Other Language Names for Davidbrownite-(NH4)
Dutch:Davidbrowniet-(NH4)
German:Davidbrownit-(NH4)
Common Associates
Associations Based on Photo Data:
| 5 photos of Davidbrownite-(NH4) associated with Antipinite | KNa3Cu2(C2O4)4 |
Related Minerals - Strunz-mindat Grouping
| 8.DG. | Jasonsmithite | Mn2+4ZnAl(PO4)4(OH)(H2O)7 · 3.5H2O |
| 8.DG. | Relianceite-(K) | K4Mg(V4+O)2(C2O4)(PO3OH)4(H2O)10 |
| 8.DG. | Pleysteinite | [(H2O)0.5K0.5]2Mn2Al3(PO4)4F2 · 14H2O |
| 8.DG.05 | Fluor-rewitzerite | [(H2O)K]Mn2(Al2Ti)(PO4)4(OF)(H2O)10 · 4H2O |
| 8.DG.05 | Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
| 8.DG.05 | Lemanskiite | NaCaCu5(AsO4)4Cl · 3H2O |
| 8.DG.05 | Sampleite | NaCaCu5(PO4)4Cl · 5H2O |
| 8.DG.05 | Zdenĕkite | NaPbCu5(AsO4)4Cl · 5H2O |
| 8.DG.05 | Rewitzerite | [K(H2O)]Mn2Al3(PO4)4(OH)2 · 14H2O |
| 8.DG.10 | Dacostaite | K(Mg2Al)[Mg(H2O)6]2(AsO4)2F6 · 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 Davidbrownite-(NH4)
mindat.org URL:
https://www.mindat.org/min-53370.html
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Please feel free to link to this page.
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References for Davidbrownite-(NH4)
Reference List:
Miyawaki, Ritsuro, Hålenius, Ulf, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2019) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) NEWSLETTER 47. European Journal of Mineralogy, 31 (1) 197-202 doi:10.1127/ejm/2019/0031-2839
Kampf, Anthony R., Cooper, Mark A., Rossman, George R., Nash, Barbara P., Hawthorne, Frank. C., Marty, Joe (2019) Davidbrownite-(NH4), (NH4,K)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O, a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA. Mineralogical Magazine, 83 (6) 869-877 doi:10.1180/mgm.2019.56
Localities for Davidbrownite-(NH4)
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.
USA (TL) | |
| Kampf et al. (2019) +1 other reference |
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125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA