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Wernerbaurite

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Formula:
{(NH4)2[Ca2(H2O)14](H2O)2}{V10O28}
Colour:
Yellow-orange
Lustre:
Sub-Adamantine
Hardness:
2
Specific Gravity:
2.352 (Calculated)
Crystal System:
Triclinic
Name:
Prof. Dr. rer. nat. Werner H. Baur (b. 1931), Geological Sciences Department of the University of Illinois, Chicago from 1965 to 1986, in positions as Associate Professor, Professor, Department Head, and Associate Dean.
This page provides mineralogical data about Wernerbaurite.


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Classification of WernerbauriteHide

Approved
Notes:
Redefined by the IMA
Approval History:
Originally approved as a hydronium mineral (IMA 2012–064), later redefined as an ammonium-bearing decavanadate mineral (Proposal IMA 15-G).

Physical Properties of WernerbauriteHide

Sub-Adamantine
Transparency:
Transparent
Colour:
Yellow-orange
Streak:
Yellow
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
{100} and {010}
Density:
2.352 g/cm3 (Calculated)

Optical Data of WernerbauriteHide

Type:
Biaxial (-)
RI values:
nα = 1.745(3) nβ = 1.780(3) nγ = 1.795(3)
2V:
Measured: 66° (2), Calculated: 65.3°
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong r >v
Pleochroism:
Strong
Comments:
X, Z = yellow, Y = orange;
Comments:
very strong dispersion produces anomalous red-orange and blue-green interference colors near the extinction positions

Chemical Properties of WernerbauriteHide

Formula:
{(NH4)2[Ca2(H2O)14](H2O)2}{V10O28}

Crystallography of WernerbauriteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.7212(6) Å, b = 10.2598(8) Å, c = 10.5928(8) Å
α = 89.999(6)°, β = 77.083(7)°, γ = 69.887(8)°
Ratio:
a:b:c = 0.948 : 1 : 1.032
Unit Cell V:
963.55 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.32(100)
9.64(92)
8.88(95)
8.10(58)
6.881(70)
6.031(39)
3.028(29)
2.842(29)
Comments:
From Type Description.

Type Occurrence of WernerbauriteHide

General Appearance of Type Material:
Tabular on {100} with stepped faces and square to octagonal outlines, up to about 1 mm in maximum dimension
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers 64002, 64003 and 64004
Geological Setting of Type Material:
The oxidation of montroseite-corvusite assemblages in a moist environment.
Associated Minerals at Type Locality:

Synonyms of WernerbauriteHide

Fluorescence of WernerbauriteHide

Other InformationHide

Notes:
dissolves instantly in cold, dilute HCl and slowly in water.
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 WernerbauriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A.R., Hughes, J.M., Marty, J. & Nash, B. (2013) Wernerbaurite {[Ca(H2O)7]2(H2O)2(H3O)2}{V10O28}, and schindlerite, {[Na2(H2O)10](H3O)4}{V10O28}, the first hydronium-bearing decavanadate minerals. Canadian Mineralogist 51, 297-312.
Kampf, A.R., Hughes, J.M., Nash, B.P., Marty, J., Cooper, M.A., Hawthorne, F.C., Karpenko, V.Y., Pautov, L.A., Agakhanov, A.A. (2016): Revision of the formulas of wernerbaurite and schindlerite: ammonium- rather than hydronium-bearing decavanadate minerals. Canadian Mineralogist: 54: 555-558.

Internet Links for WernerbauriteHide

Localities for WernerbauriteHide

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)
 
  • Colorado
    • San Miguel Co.
      • Slick Rock District
        • Gypsum Valley
Kampf, A.R., Hughes, J.M., Marty, J. and Nash, B. (2013) Wernerbaurite, IMA 2012-064. CNMNC Newsletter No. 15, February 2013, page 6; Mineralogical Magazine, 77, 1-12.
Mineral and/or Locality  
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