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Davidbrownite-(NH4)

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New structure type. Unique combination of elements (compare rowleyite, though). The first vanadium-bearing oxalate mineral. The first approved organic vanadium mineral.


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Classification of Davidbrownite-(NH4)Hide

IMA status:
Approved, Pending publication
Approval Year:
2019

Chemical Properties of Davidbrownite-(NH4)Hide

Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O
Elements listed:
C, H, N, O, P, V - search for minerals with similar chemistry

Crystallography of Davidbrownite-(NH4)Hide

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)°
Ratio:
a:b:c = 1.161 : 1 : 1.511
Unit Cell V:
1,244.89 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.39(100)
6.73(50)
5.97(34)
3.789(35)
3.160(47)
3.104(42)
3.043(35)
2.977(44)

Type Occurrence of Davidbrownite-(NH4)Hide

Type Locality:
ⓘ 125 foot level, Rowley Mine (Rawley Mine; Reliance Mine; Reliance Copper Mine; Rainbow Mine; Theba Mine; San Carlos patented claim #4524), Theba, Painted Rock District, Painted Rock Mts, Maricopa Co., Arizona, USA
Place of Conservation of Type Material:
mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 66951, 66955 and 66959 (cotypes)

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Davidbrownite-(NH4)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
How to cite: Kampf, A.R., Cooper, M.A., Rossman, G.R., Nash, B.P., Hawthorne, F.C. and Marty, J. (2019): Davidbrownite, IMA 2018-129. CNMNC Newsletter No. 47, February 2019: 203; European Journal of Mineralogy: 31: 199–204.

Internet Links for Davidbrownite-(NH4)Hide

Localities for Davidbrownite-(NH4)Hide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA (TL)
 
  • Arizona
    • Maricopa Co.
      • Painted Rock Mts
        • Painted Rock District
          • Theba
            • Rowley Mine (Rawley Mine; Reliance Mine; Reliance Copper Mine; Rainbow Mine; Theba Mine; San Carlos patented claim #4524)
Kampf, A.R., Cooper, M.A., Rossman, G.R., Nash, B.P., Hawthorne, F.C. and Marty, J. (2019): Davidbrownite, IMA 2018-129. CNMNC Newsletter No. 47, February 2019: 203; European Journal of Mineralogy: 31: 199–204.
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