Doloresite
A valid IMA mineral species - grandfathered
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About Doloresite
Dolores River
Formula:
V4+3O4(OH)4
Colour:
Nearly black with dark bronzy tarnish. Very fine fragments under oil immersion are reddish brown to yellow red in transmitted light.
Lustre:
Sub-Metallic
Specific Gravity:
3.27 - 3.33
Crystal System:
Monoclinic
Name:
Named for the Dolores River, "a major stream of the Colorado Plateau" and near the type locality.
Often intimately intermixed with other vanadium oxide minerals, especially montroseite–paramontroseite.
Unique Identifiers
Mindat ID:
1305
Long-form identifier:
mindat:1:1:1305:1
IMA Classification of Doloresite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1957
Classification of Doloresite
4.HE.30
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
47.4.7.1
47 : VANADIUM OXYSALTS
4 : Vanadium Bronzes
47 : VANADIUM OXYSALTS
4 : Vanadium Bronzes
7.12.6
7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta
7 : Oxides and Hydroxides
12 : Oxides of V, Nb and Ta
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 |
|---|---|---|
| Dlr | 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 Doloresite
Sub-Metallic
Transparency:
Translucent, Opaque
Colour:
Nearly black with dark bronzy tarnish. Very fine fragments under oil immersion are reddish brown to yellow red in transmitted light.
Streak:
Greenish black
Cleavage:
Distinct/Good
Flaky
Flaky
Fracture:
Fibrous
Density:
3.27 - 3.33 g/cm3 (Measured) 3.41 g/cm3 (Calculated)
Comment:
Measured with a Berman balance.
Optical Data of Doloresite
Type:
Biaxial
RI values:
n = 1.90
Max. Birefringence:
δ = 0.000
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High
Anisotropism:
Strong
Colour in reflected light:
Gray, variable along the elongation of the crystals, and shows selective absorption in plane polarized light
Chemistry of Doloresite
Mindat Formula:
V4+3O4(OH)4
Elements listed:
Crystallography of Doloresite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.64(6) Å, b = 2.99(1) Å, c = 4.83(2) Å
β = 103.91°
β = 103.91°
Ratio:
a:b:c = 6.569 : 1 : 1.615
Unit Cell V:
275.32 ų (Calculated from Unit Cell)
Z:
5
Twinning:
Lamellar submicroscopic twinning.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0009206 | Doloresite | Evans H T, Mrose M E (1958) The crystal structures of three new vanadium oxide minerals Acta Crystallographica 11 56-58 |  | 1958 | Carlile, Wyoming, USA | 0 | 293 |
| 0000095 | Doloresite | Evans H T, Mrose M E (1960) A crystal chemical study of the vanadium oxide minerals, haggite and doloresite American Mineralogist 45 1144-1166 |  | 1960 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.70 Å | (100) |
| 3.83 Å | (50) |
| 3.16 Å | (42) |
| 2.98 Å | (15) |
| 2.45 Å | (50) |
| 1.933 Å | (25) |
| 1.799 Å | (21) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47e : [Vanadates, chromates, manganates] |
Type Occurrence of Doloresite
Place of Conservation of Type Material:
No defined type material.
Geological Setting of Type Material:
Unoxidized vanadium-uranium ores in sandstone. Secondary replacement of primary montroseite.
Associated Minerals at Type Locality:
Other Language Names for Doloresite
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 4.HE.05 | Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O |
| 4.HE.10 | Shcherbinaite | V5+2O5 |
| 4.HE.15 | Hewettite | CaV6O16 · 9H2O |
| 4.HE.15 | Metahewettite | CaV6O16 · 3H2O |
| 4.HE.20 | Bariandite | Al0.6(V5+,V4+)8O20 · 9H2O |
| 4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 4.HE.20 | Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 · 7.5H2O |
| 4.HE.20 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O |
| 4.HE.20 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O |
| 4.HE.25 | Häggite | V3+V4+O2(OH)3 |
| 4.HE.35 | Duttonite | V4+O(OH)2 |
| 4.HE.40 | Cavoite | CaV4+3O7 |
Other Information
Notes:
Slowly soluble in 1:1 HCl, yielding a green solution. 1:1 HNO3 yields a blue solution. No reaction is observed with 1:1 NH4OH. Slightly soluble in 40% KOH. No reaction with either 20% KCN or 20% FeCl2.
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 Doloresite
mindat.org URL:
https://www.mindat.org/min-1305.html
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References for Doloresite
Reference List:
Stern, T. W., Stief, L. R., Evans, H. T., Sherwood, A. M. (1957) Doloresite, a new vanadium oxide mineral from the Colorado plateau. American Mineralogist, 42 (9-10) 587-593
Evans, H. T., Mrose, M. E. (1958) The crystal structures of three new vanadium oxide minerals. Acta Crystallographica, 11 (1) 56-58 doi:10.1107/s0365110x58000141
Localities for Doloresite
Showing 32 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.
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Radon Mine, Lisbon Valley Mining District, San Juan County, Utah, USA