Metahewettite
A valid IMA mineral species - grandfathered
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About Metahewettite
Formula:
CaV6O16 Β· 3H2O
Colour:
Deep red; red to orange in transmitted light
Lustre:
Silky, Dull
Specific Gravity:
2.51 - 2.94
Crystal System:
Monoclinic
Member of:
Name:
In allusion to its lesser water content and relationship to Hewettite.
Type Locality:
Unique Identifiers
Mindat ID:
2674
Long-form identifier:
mindat:1:1:2674:7
GUID
(UUID V4):
(UUID V4):
5b9854ba-9162-4d33-a5d3-4190a7d9503d
IMA Classification of Metahewettite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaV5+6O16 Β· 3H2O
First published:
1914
Classification of Metahewettite
4.HE.15
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
47.3.1.2
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
21.2.3
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 IMAβCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Mhew | IMAβCNMNC | Warr, L.N. (2021). IMAβCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Metahewettite
Silky, Dull
Transparency:
Translucent
Colour:
Deep red; red to orange in transmitted light
Streak:
Maroon to brownish red
Comment:
Soft
Density:
2.51 - 2.94 g/cm3 (Measured) 3.05 g/cm3 (Calculated)
Comment:
Measured values are for material with 9H2O and 3H2O, respectively
Optical Data of Metahewettite
Type:
Biaxial (-)
RI values:
nα = 1.700 nβ = 2.100 nγ = 2.230
2V:
Calculated: 52°
Max Birefringence:
δ = 0.530
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
Pleochroism:
Visible
Comments:
X = c = Light yellow-orange
Y = b = Deep red
Z = a = Deeper red
Y = b = Deep red
Z = a = Deeper red
Comments:
2V measured: not determined.
Chemistry of Metahewettite
Mindat Formula:
CaV6O16 Β· 3H2O
Elements listed:
Crystallography of Metahewettite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 12.15 Å, b = 3.607 Å, c = 18.44 Å
β = 118.03°
β = 118.03°
Ratio:
a:b:c = 3.368 : 1 : 5.112
Unit Cell V:
713.34 Γ
Β³ (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals microscopic laths or tablets, flattened on {001} and bounded laterally by {010} and {110}, with a prism angle of 57Β°; in parallel or radial-fibrous masses; powdery; coatings.
Comment:
Space Group = A2/m
Crystal Structure
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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) |
---|---|---|---|---|---|---|---|
0005078 | Metahewettite | Bachmann H G, Barnes W H (1962) The crystal structure of a sodium-calcium variety of metahewettite The Canadian Mineralogist 7 219-235 | 1962 | Paradox Valley, Montrose County, Coldrado,USA | 0 | 293 | |
0005079 | Metahewettite | Bachmann H G, Barnes W H (1962) The crystal structure of a sodium-calcium variety of metahewettite The Canadian Mineralogist 7 219-235 | 1962 | Paradox Valley, Montrose County, Coldrado,USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
8.19 Γ | (100) |
5.36 Γ | (12) |
3.578 Γ | (30) |
3.062 Γ | (18) |
2.812 Γ | (24) |
2.295 Γ | (17) |
2.206 Γ | (22) |
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] |
Geological Setting:
Colorado Plateau-type U-V deposits.
Type Occurrence of Metahewettite
General Appearance of Type Material:
Deep red, loose, earthy powder. Also as compact aggregates of separable, shining blades. The earthy variety consists of minute sharply bounded tables about 40 ΞΌm long, piled in subparallel groups.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, USA: #93306. U.S. National Museum of Natural History, Washington, D.C., USA: #93305 through 93308.
Geological Setting of Type Material:
Colorado Plateau-type U-V deposit. Impregnation in sandstone, generally coating the sandstone grains, sometimes filling cavities and crevices.
Associated Minerals at Type Locality:
Reference:
Hillebrand, W.F., Merwin, H.E., Wright, F.E. (1914) Hewettite, metahewettite and pascoite, hydrous calcium vanadates. Proceedings of the American Philosophical Society, 53, 31-54.
Other Language Names for Metahewettite
Relationship of Metahewettite to other Species
Member of:
Other Members of this group:
Barnesite | (Na,Ca)V6O16 Β· 3H2O | Mon. 2/m : P2/m |
Grantsite | (Na,Ca)2+x(V5+,V4+)6O16 Β· 4H2O | Mon. 2/m : P21/m |
Hendersonite | (Ca,Sr)1.3V6O16 Β· 6H2O | Orth. |
Hewettite | CaV6O16 Β· 9H2O | Mon. 2/m : P21/m |
Common Associates
Associated Minerals Based on Photo Data:
4 photos of Metahewettite associated with Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 Β· 6-10H2O |
3 photos of Metahewettite associated with Uraninite | UO2 |
3 photos of Metahewettite associated with Rossite | Ca(VO3)2 Β· 4H2O |
1 photo of Metahewettite associated with Carnotite | K2(UO2)2(VO4)2 Β· 3H2O |
1 photo of Metahewettite associated with Francevillite | Ba(UO2)2(VO4)2 Β· 5H2O |
1 photo of Metahewettite associated with Pascoite Group | |
1 photo of Metahewettite associated with Pascoite | Ca2Ca(V10O28) Β· 17H2O |
1 photo of Metahewettite associated with Gypsum | CaSO4 Β· 2H2O |
1 photo of Metahewettite associated with Hewettite | CaV6O16 Β· 9H2O |
1 photo of Metahewettite associated with Metarossite | Ca(V2O6) Β· 2H2O |
Related Minerals - Strunz-mindat Grouping
4.HE.05 | Melanovanadite | Ca(V5+,V4+)4O10 Β· 5H2O |
4.HE.10 | Shcherbinaite | V5+2O5 |
4.HE.15 | Hewettite | CaV6O16 Β· 9H2O |
4.HE.20 | Bariandite | Al0.6(V5+,V4+)8O20 Β· 9H2O |
4.HE.20 | Bokite | (Al,Fe)1.3(V5+,V4+,Fe3+)8O20 Β· 7.5H2O |
4.HE.20 | Corvusite | (Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 Β· 6-10H2O |
4.HE.20 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 Β· 10H2O |
4.HE.20 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 Β· 3H2O |
4.HE.25 | HΓ€ggite | V3+V4+O2(OH)3 |
4.HE.30 | Doloresite | V4+3O4(OH)4 |
4.HE.35 | Duttonite | V4+O(OH)2 |
4.HE.40 | Cavoite | CaV4+3O7 |
Other Information
Notes:
Reversibly hydrates to Hewettite. Slightly soluble 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.
Internet Links for Metahewettite
mindat.org URL:
https://www.mindat.org/min-2674.html
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References for Metahewettite
Reference List:
Barnes, W. H., Qurashi, M. M. (1952) Unit cell and space group data for certain vanadium minerals. American Mineralogist, 37 (5-6) 407-422
Bayliss, Peter, Warne, Slade St. J. (1979) X-ray powder data for metahewettite. Mineralogical Magazine, 43 (328) 550 doi:10.1180/minmag.1979.043.328.20
Bayliss, Peter (1982) X-ray powder data for hewettite. Mineralogical Magazine, 46 (341) 503-504 doi:10.1180/minmag.1982.046.341.18
Localities for Metahewettite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
β - 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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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Ambrosia Lake Mining Sub-district, McKinley County, New Mexico, USA