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Donowensite
A valid IMA mineral species
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About Donowensite
Don R. Owens
Formula:
Ca(H2O)3Fe3+2(V2O7)2
Colour:
Yellow
Lustre:
Sub-Adamantine
Hardness:
3
Specific Gravity:
2.97
Crystal System:
Triclinic
Name:
Named in honor of Don Ray Owens (18 March 1937, Stuttgart, Arkansas, USA - 20 October 2015, Hot Springs, Arkansas, USA), chief geologist at the Union Carbide Christy Vanadium Mine, Arkansas and professor of geology at the University of Arkansas.
New structure type.
Co-descibed with mikehowardite.
Structure is based of sheets formed by:
* zig-zag chains comprising edge-sharing FeO6 octahedra, linked to each other via...
* ... pyrovanadate groups
The Ca2+ cations and water reside between the sheets.
Co-descibed with mikehowardite.
Structure is based of sheets formed by:
* zig-zag chains comprising edge-sharing FeO6 octahedra, linked to each other via...
* ... pyrovanadate groups
The Ca2+ cations and water reside between the sheets.
Unique Identifiers
Mindat ID:
55311
Long-form identifier:
mindat:1:1:55311:9
IMA Classification of Donowensite
Classification of Donowensite
8.FC.
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
C : Polyphosphates, etc., with H2O only
8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
C : Polyphosphates, etc., with H2O only
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 |
|---|---|---|
| Dnw | 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 Donowensite
Sub-Adamantine
Colour:
Yellow
Streak:
Orange
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {001}; also very good on {100} and {010}
on {001}; also very good on {100} and {010}
Fracture:
Splintery
Density:
2.97(2) g/cm3 (Measured)
Optical Data of Donowensite
Type:
Biaxial (+)
Dispersion:
r > v, moderate
Optical Extinction:
X ∧ b = 7°; Z ≈ c.
Pleochroism:
Visible
Comments:
X = brown orange; Y = orange yellow; Z = yellow.
Comments:
nα > 1.95; nβ > 1.95; nγ > 1.95. The Gladstone-Dale relationship predicts an average R.I. of 1.958. Had the authors reported an observed birefringence, that combined with the 2V and predicted average R.I. could have allowe
Chemistry of Donowensite
Mindat Formula:
Ca(H2O)3Fe3+2(V2O7)2
Element Weights:
Crystallography of Donowensite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 7.3452(4) Å, b = 9.9291(4) Å, c = 10.0151(7) Å
α = 94.455(7)°, β = 98.476(7)°, γ = 100.779(7)°
α = 94.455(7)°, β = 98.476(7)°, γ = 100.779(7)°
Ratio:
a:b:c = 0.74 : 1 : 1.009
Unit Cell V:
705.51 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 9.88 Å | (100) |
| 7.12 Å | (24) |
| 4.176 Å | (17) |
| 3.671 Å | (20) |
| 3.283 Å | (44) |
| 3.202 Å | (22) |
| 3.110 Å | (19) |
| 2.973 Å | (26) |
Type Occurrence of Donowensite
General Appearance of Type Material:
Needles, up to 1 mm in length.
Place of Conservation of Type Material:
Cotype material is deposited in the mineralogical collections of the Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USA, catalogue numbers 75041 and 75042.
Geological Setting of Type Material:
Oxidation of primary ore V minerals contained in altered rocks contacting with an igneous complex.
Synonyms of Donowensite
Other Language Names for Donowensite
Dutch:Donowensiet
German:Donowensit
Common Associates
Associations Based on Photo Data:
| 4 photos of Donowensite associated with Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O |
| 2 photos of Donowensite associated with Mikehowardite | Fe3+4(V5+O4)4(H2O)2 · H2O |
Related Minerals - Strunz-mindat Grouping
| 8.FC.X | Hylbrownite | Na3Mg(P3O10) · 12H2O |
| 8.FC.05 | Fianelite | Mn2+2((V,As)2O7) · 2H2O |
| 8.FC.05 | Rüdlingerite | Mn2+2V5+As5+O7 · 2H2O |
| 8.FC.10 | Canaphite | Na2Ca(P2O7) · 4H2O |
| 8.FC.15 | Pintadoite | Ca2(V2O7) · 9H2O |
| 8.FC.20 | 'Arnhemite' | (K,Na)4Mg2(P2O7)2 · 5H2O |
| 8.FC.25 | Wooldridgeite | Na2CaCu2+2(P2O7)2 · 10H2O |
| 8.FC.30 | Kanonerovite | Na3Mn2+(P3O10) · 12H2O |
| 8.FC.35 | Mesaite | CaMn2+5(V2O7)3 · 12H2O |
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 Donowensite
mindat.org URL:
https://www.mindat.org/min-55311.html
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References for Donowensite
Reference List:
Miyawaki, Ritsuro, Hatert, Frédéric, Pasero, Marco, Mills, Stuart J. (2021) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) – Newsletter 59. European Journal of Mineralogy, 33 (1) 139-143 doi:10.5194/ejm-33-139-2021
Kampf, Anthony R., Hughes, John M., Nash, Barbara P., Smith, Jason B. (2022) Donowensite, Ca(H2O)3Fe3+2(V2O7)2, and mikehowardite, Fe3+4(VO4)4(H2O)2·H2O, two new vanadium minerals from the Wilson Springs Vanadium Mine, Wilson Springs, Arkansas, USA. The Canadian Mineralogist, 60 (3) 543-554 doi:10.3749/canmin.210015
Localities for Donowensite
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) | |
| Miyawaki et al. (2021) +1 other reference |
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North Wilson pit, Union Carbide Mine, Wilson Springs, Garland County, Arkansas, USA