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.
Unique Identifiers
Mindat ID:
53370
Long-form identifier:
mindat:1:1:53370:8
GUID
(UUID V4):
(UUID V4):
7d26de41-d9c0-4204-bb3e-9cdd8746afff
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 |
---|---|---|
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
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:
Low
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
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) |
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, A.R., Cooper, M.A., Rossman, G.R., Nash, B.P., Hawthorne, F.C., Marty, J. (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: 869-877.
Synonyms of Davidbrownite-(NH4)
Common Associates
Associated Minerals Based on Photo Data:
2 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. | Rewitzerite | [K(H2O)]Mn2Al3(PO4)4(OH)2 · 14H2O |
8.DG.05 | Lavendulan | NaCaCu5(AsO4)4Cl · 5H2O |
8.DG.05 | Sampleite | NaCaCu5(PO4)4Cl · 5H2O |
8.DG.05 | Shubnikovite | Ca2Cu8(AsO4)6(OH)Cl · 7H2O |
8.DG.05 | Zdenĕkite | NaPbCu5(AsO4)4Cl · 5H2O |
8.DG.05 | Lemanskiite | NaCaCu5(AsO4)4Cl · 3H2O |
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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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)
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.
USA (TL) | |
| Kampf et al. (2019) |
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125 foot level, Rowley Mine, Theba, Painted Rock Mining District, Painted Rock Mountains, Maricopa County, Arizona, USA