Metarossite
A valid IMA mineral species - grandfathered
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About Metarossite
Clarence S. Ross
Formula:
Ca(V2O6) · 2H2O
Colour:
Very light yellow to pale greenish yellow; colourless to pale yellow in transmitted light
Lustre:
Pearly, Dull
Hardness:
1 - 2
Specific Gravity:
2.8 (Calculated)
Crystal System:
Triclinic
Name:
Named for its relationship to rossite, where 'meta' refers to natural dehydration. It was named at the same time as rossite, where the root name is for Dr. Clarence Samuel Ross (September 20, 1880 - April 19, 1975, Rockville, Maryland, USA), American geologist and mineralogist, U.S. Geological Survey, Washington, D.C., USA.
Unique Identifiers
Mindat ID:
2682
Long-form identifier:
mindat:1:1:2682:2
GUID
(UUID V4):
(UUID V4):
2bacf567-6fc9-4563-bf94-373ebd3cfc36
IMA Classification of Metarossite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaV5+2O6 · 2H2O
First published:
1928
Classification of Metarossite
4.HD.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
D : Inovanadates
47.1.1.2
47 : VANADIUM OXYSALTS
1 : Normal Anhydrous Vanadium Oxysalts
47 : VANADIUM OXYSALTS
1 : Normal Anhydrous Vanadium Oxysalts
21.2.1
21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
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 |
|---|---|---|
| Mrs | 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 Metarossite
Pearly, Dull
Transparency:
Translucent
Colour:
Very light yellow to pale greenish yellow; colourless to pale yellow in transmitted light
Hardness:
1 - 2 on Mohs scale
Tenacity:
Fragile
Density:
2.8 g/cm3 (Calculated)
Optical Data of Metarossite
Type:
Biaxial (+)
RI values:
nα = 1.840 nβ = 1.850 nγ = 1.850
2V:
Measured: 70°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively strong
Chemistry of Metarossite
Mindat Formula:
Ca(V2O6) · 2H2O
Elements listed:
Crystallography of Metarossite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.215 Å, b = 7.065 Å, c = 7.769 Å
α = 92.97°, β = 96.65°, γ = 105.78°
α = 92.97°, β = 96.65°, γ = 105.78°
Ratio:
a:b:c = 0.88 : 1 : 1.1
Unit Cell V:
324.82 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals platy; flaky; massive. As alteration rims on and complete replacements of rossite.
Twinning:
On {101} as the twin plane.
Comment:
parameters from the recent redetermination (Kobsch et al., 2016): a=6.2059(4), b=7.0635(4), c=7.7516(5), α=93.166(4), β=96.548(4), γ=105.883(4)Å, V=323.36(4) (Å3)
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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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) |
|---|---|---|---|---|---|---|---|
| 0005077 | Metarossite | Kelsey C H, Barnes W H (1960) The crystal structure of metarossite The Canadian Mineralogist 6 448-466 |  | 1960 | Thompson's, Utah, USA | 0 | 293 |
| 0020635 | Metarossite | Kobsch A, Downs R T, Domanik K J (2016) Redetermination of metarossite, CaV5+2O6*2H2O Acta Crystallographica E72 1280-1284 |  | 2016 | Blue Cap mine, San Juan County, Utah, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.9 Å | (strong) |
| 5.1 Å | (strong) |
| 3.05 Å | (moderate) |
Comments:
Colorado, USA. The data are from Weeks and Thompson (1954).
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 10b: Anthropogenic minerals | <10 Ka |
| 55 : Anthropogenic mine minerals |
Type Occurrence of Metarossite
General Appearance of Type Material:
Veinlets, alteration rims on rossite lumps.
Place of Conservation of Type Material:
U.S. National Museum of Natural History, Washington, D.C., USA: #95331A, R5707A.
Geological Setting of Type Material:
Carnotite-bearing sandstone.
Associated Minerals at Type Locality:
Reference:
Foshag, W.F., Hess, F.L. (1928) Rossite and metarossite; two new vanadates from Colorado. Proceedings of the U.S. National Museum: 72: 1-12.
Other Language Names for Metarossite
Common Associates
Associated Minerals Based on Photo Data:
| 11 photos of Metarossite associated with Pascoite | Ca2Ca(V10O28) · 17H2O |
| 6 photos of Metarossite associated with Dickthomssenite | Mg(V2O6) · 7H2O |
| 5 photos of Metarossite associated with Rossite | Ca(VO3)2 · 4H2O |
| 3 photos of Metarossite associated with Montroseite | (V3+,Fe3+)O(OH) |
| 2 photos of Metarossite associated with Pascoite Group | |
| 2 photos of Metarossite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 · 6-10H2O |
| 2 photos of Metarossite associated with Paramontroseite | V4+O2 |
| 1 photo of Metarossite associated with Coffinite | U(SiO4) · nH2O |
| 1 photo of Metarossite associated with Hummerite | K2Mg2(V10O28) · 16H2O |
| 1 photo of Metarossite associated with Calciodelrioite | Ca(VO3)2 · 4H2O |
Related Minerals - Strunz-mindat Grouping
| 4.HD. | Pseudodickthomssenite | Mg(VO3)2 · 8H2O |
| 4.HD.05 | Rossite | Ca(VO3)2 · 4H2O |
| 4.HD.15 | Munirite | NaVO3 · 1.9H2O |
| 4.HD.20 | Metamunirite | NaVO3 |
| 4.HD.25 | Dickthomssenite | Mg(V2O6) · 7H2O |
| 4.HD.30 | Ansermetite | Mn2+(V2O6) · 4H2O |
Other Information
Thermal Behaviour:
Heated before the blowpipe, metarossite fuses easily to a black bead without coloring the flame. Heated in a closed tube it fuses easily and gives off water.
Notes:
Soluble in water. When moisted with concentrated HCl, metarossite turns mahogany red (vanadic acid).
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 Metarossite
mindat.org URL:
https://www.mindat.org/min-2682.html
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References for Metarossite
Localities for Metarossite
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The Locality List
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- This locality has estimated coordinates.
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? - 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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Firefly–Pigmay Mine, La Sal Creek Mining District, San Juan County, Utah, USA