Montroseite
A valid IMA mineral species - grandfathered
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About Montroseite
Formula:
(V3+,Fe3+)O(OH)
Colour:
Black to grayish black
Lustre:
Sub-Metallic
Hardness:
5½ - 6½
Specific Gravity:
4.0
Crystal System:
Orthorhombic
Member of:
Name:
Named by A.D. Weeks, E.A. Cisney, and A.M. Sherwood in 1951 for Montrose County, Colorado, tht includes the type locality.
Unique Identifiers
Mindat ID:
2769
Long-form identifier:
mindat:1:1:2769:0
GUID
(UUID V4):
(UUID V4):
89c46507-5f36-4ecb-8539-472dec686171
IMA Classification of Montroseite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
(V3+,Fe2+,V4+)O(OH)
First published:
1951
Classification of Montroseite
4.FD.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
D : Hydroxides with OH, without H2O; chains of edge-sharing octahedra
6.1.1.4
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
6 : HYDROXIDES AND OXIDES CONTAINING HYDROXYL
1 : XO(OH)
7.12.1
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 |
|---|---|---|
| Mto | 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 Montroseite
Sub-Metallic
Transparency:
Opaque
Colour:
Black to grayish black
Streak:
Black
Hardness:
5½ - 6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010} and {110}, good.
{010} and {110}, good.
Density:
4.0 g/cm3 (Measured) 4.11 g/cm3 (Calculated)
Optical Data of Montroseite
Type:
Biaxial
Pleochroism:
Strong
Comments:
black and red
Chemistry of Montroseite
Mindat Formula:
(V3+,Fe3+)O(OH)
Elements listed:
Common Impurities:
Al
Crystallography of Montroseite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:
a = 4.82 Å, b = 9.48 Å, c = 2.93 Å
Ratio:
a:b:c = 0.508 : 1 : 0.309
Unit Cell V:
133.88 ų (Calculated from Unit Cell)
Z:
4
Comment:
Space Group: P bnm.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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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) |
|---|---|---|---|---|---|---|---|
| 0000062 | Montroseite | Evans H T, Block S (1953) The crystal structure of montroseite, a vanadium member of the diaspore group American Mineralogist 38 1242-1250 |  | 1953 | 0 | 293 | |
| 0000073 | Montroseite | Evans H T, Mrose M E (1955) A crystal chemical study of montroseite and paramontroseite. American Mineralogist 40 861-875 | | 1955 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.31 Å | (s) |
| 2.644 Å | (s) |
| 3.38 Å | (m) |
| 2.495 Å | (m) |
| 2.217 Å | (m) |
| 1.512 Å | (m) |
| 2.423 Å | (w) |
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] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
Type Occurrence of Montroseite
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, 106897, 106898.
Reference:
Weeks, A.D., Cisney, E.A., Sherwood, A.M. (1951) Hummerite and montroseite, two vanadium minerals from Montrose County, Colorado. Abstracts of papers presented at the thirty-first annual meeting of the Mineralogical Society of America at Washington, D.C.. American Mineralogist: 36: 310-328.
Other Language Names for Montroseite
Relationship of Montroseite to other Species
Member of:
Other Members of this group:
| Bracewellite | CrO(OH) | Orth. mmm (2/m 2/m 2/m) |
| Diaspore | AlO(OH) | Orth. mmm (2/m 2/m 2/m) |
| Goethite | α-Fe3+O(OH) | Orth. mmm (2/m 2/m 2/m) |
| Groutite | Mn3+O(OH) | Orth. mmm (2/m 2/m 2/m) : Pnma |
| Tsumgallite | GaO(OH) | Orth. mmm (2/m 2/m 2/m) |
Common Associates
Associated Minerals Based on Photo Data:
| 17 photos of Montroseite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 9 photos of Montroseite associated with Pascoite | Ca2Ca(V10O28) · 17H2O |
| 5 photos of Montroseite associated with Uraninite | UO2 |
| 5 photos of Montroseite associated with Sandstone | |
| 4 photos of Montroseite associated with Paramontroseite | V4+O2 |
| 3 photos of Montroseite associated with Schindlerite | {(NH4)4Na2(H2O)10}{V10O28} |
| 3 photos of Montroseite associated with Gypsum | CaSO4 · 2H2O |
| 3 photos of Montroseite associated with Calcite | CaCO3 |
| 3 photos of Montroseite associated with Rossite | Ca(VO3)2 · 4H2O |
| 3 photos of Montroseite associated with Metarossite | Ca(V2O6) · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 4.FD.05 | Spertiniite | Cu(OH)2 |
| 4.FD.10 | Bracewellite | CrO(OH) |
| 4.FD.10 | Diaspore | AlO(OH) |
| 4.FD.10 | Groutite | Mn3+O(OH) |
| 4.FD.10 | Guyanaite | CrO(OH) |
| 4.FD.10 | Tsumgallite | GaO(OH) |
| 4.FD.15 | Manganite | Mn3+O(OH) |
| 4.FD.20 | Yttrotungstite-(Y) | YW2O6(OH)3 |
| 4.FD.20 | Yttrotungstite-(Ce) | (Ce,Nd,Y)W2O6(OH)3 |
| 4.FD.25 | Frankhawthorneite | Cu2Te6+O4(OH)2 |
| 4.FD.30 | Khinite | Pb2+Cu2+3[Te6+O6](OH)2 |
| 4.FD.30 | Khinite-3T | Pb2+Cu2+3Te6+O6(OH)2 |
| 4.FD.30 | Housleyite | Pb6CuTe6+4O18(OH)2 |
Other Information
Special Storage/
Display Requirements:
Display Requirements:
Rapidly transforms topotactically to paramontroseite in air.
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 Montroseite
mindat.org URL:
https://www.mindat.org/min-2769.html
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References for Montroseite
Reference List:
Hurlbut, C. S. Jr. (1951) Proceedings of the thirty-first annual meeting of the Mineralogical Society of America at Washington, D. C. American Mineralogist, 36 (3-4) 304-328 pp.326-327
Weeks, Alice D., Cisney, Evelyn A., Sherwood, and Alexander M. (1953) Montroseite, a new vanadium oxide from the Colorado Plateaus. American Mineralogist, 38 (11-12) 1235-1241
Evans, Howard T., Block, and Stanley (1953) The crystal structure of montroseite, a vanadium member of the diaspore group. American Mineralogist, 38 (11-12) 1242-1250
Localities for Montroseite
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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