SUPPORT US. Covid-19 has significantly affected our fundraising. Please help!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral Quiz
Photo SearchPhoto GalleriesSearch by ColorNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Davidbrownite-(NH4)

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About Davidbrownite-(NH4)Hide

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). The first vanadium-bearing oxalate mineral. The first approved organic vanadium mineral.


Classification of Davidbrownite-(NH4)Hide

Approved
Approval year:
2019
First published:
2019

Physical Properties of Davidbrownite-(NH4)Hide

Vitreous
Colour:
Light green-blue
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
Probably {100} and {001}
Fracture:
Splintery
Density:
2.12(2) g/cm3 (Measured)    

Optical Data of Davidbrownite-(NH4)Hide

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.
Surface Relief:
Low
Dispersion:
moderate, r>v
Pleochroism:
Visible
Comments:
X = pale blue, Y = nearly colorless, Z = lightblue; Y
Comments:
Z=b,Y≈a

Chemical Properties of Davidbrownite-(NH4)Hide

Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O
IMA Formula:
(NH4)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4 · 3H2O

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:
1244.9 ų
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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)

Type Occurrence of Davidbrownite-(NH4)Hide

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)Hide

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)
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.
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.

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 Mountains
        • Painted Rock Mining 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., 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.
 
Mineral and/or Locality  
Mindat Discussions Facebook Logo Instagram Logo Discord Logo
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2021, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us - Report a bug/vulnerability Current server date and time: April 14, 2021 03:00:17 Page generated: March 8, 2021 11:26:13
Go to top of page