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Metahewettite

A valid IMA mineral species - grandfathered
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About MetahewettiteHide

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.
A tertiary mineral resulting from the dehydration of Hewettite as impregnations in sandstone.


Unique IdentifiersHide

Mindat ID:
2674
Long-form identifier:
mindat:1:1:2674:7
GUID
(UUID V4):
5b9854ba-9162-4d33-a5d3-4190a7d9503d

IMA Classification of MetahewettiteHide

Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
CaV5+6O16 Β· 3H2O
First published:
1914

Classification of MetahewettiteHide

4.HE.15

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
21.2.3

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference
MhewIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MetahewettiteHide

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 MetahewettiteHide

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.
Surface Relief:
Very High
Dispersion:
relatively strong
Pleochroism:
Visible
Comments:
X = c = Light yellow-orange
Y = b = Deep red
Z = a = Deeper red
Comments:
2V measured: not determined.

Chemistry of MetahewettiteHide

Mindat Formula:
CaV6O16 Β· 3H2O

Crystallography of MetahewettiteHide

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°
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 StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005078MetahewettiteBachmann H G, Barnes W H (1962) The crystal structure of a sodium-calcium variety of metahewettite The Canadian Mineralogist 7 219-2351962Paradox Valley, Montrose County, Coldrado,USA0293
0005079MetahewettiteBachmann H G, Barnes W H (1962) The crystal structure of a sodium-calcium variety of metahewettite The Canadian Mineralogist 7 219-2351962Paradox Valley, Montrose County, Coldrado,USA0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest 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 MetahewettiteHide

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 MetahewettiteHide

Relationship of Metahewettite to other SpeciesHide

Member of:
Other Members of this group:
Barnesite(Na,Ca)V6O16 Β· 3H2OMon. 2/m : P2/m
Grantsite(Na,Ca)2+x(V5+,V4+)6O16 Β· 4H2OMon. 2/m : P21/m
Hendersonite(Ca,Sr)1.3V6O16 Β· 6H2OOrth.
HewettiteCaV6O16 Β· 9H2OMon. 2/m : P21/m

Common AssociatesHide

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 UraniniteUO2
3 photos of Metahewettite associated with RossiteCa(VO3)2 Β· 4H2O
1 photo of Metahewettite associated with CarnotiteK2(UO2)2(VO4)2 Β· 3H2O
1 photo of Metahewettite associated with FrancevilliteBa(UO2)2(VO4)2 Β· 5H2O
1 photo of Metahewettite associated with Pascoite Group
1 photo of Metahewettite associated with PascoiteCa2Ca(V10O28) Β· 17H2O
1 photo of Metahewettite associated with GypsumCaSO4 Β· 2H2O
1 photo of Metahewettite associated with HewettiteCaV6O16 Β· 9H2O
1 photo of Metahewettite associated with MetarossiteCa(V2O6) Β· 2H2O

Related Minerals - Strunz-mindat GroupingHide

4.HE.05MelanovanaditeCa(V5+,V4+)4O10 Β· 5H2OTric. 1 : P1
4.HE.10ShcherbinaiteV5+2O5Orth. mmm (2/m 2/m 2/m) : Pmmn
4.HE.15HewettiteCaV6O16 Β· 9H2OMon. 2/m : P21/m
4.HE.20BarianditeAl0.6(V5+,V4+)8O20 Β· 9H2OMon.
4.HE.20Bokite(Al,Fe)1.3(V5+,V4+,Fe3+)8O20 Β· 7.5H2OMon.
4.HE.20Corvusite(Na,K,Ca,Mg)2(V5+,V4+,Fe2+)8O20 Β· 6-10H2OMon. 2/m : B2/m
4.HE.20Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 Β· 10H2OMon. 2/m : B2/m
4.HE.20Straczekite(Ca,K,Ba)(V5+,V4+)8O20 Β· 3H2OMon. 2/m : B2/m
4.HE.25HΓ€ggiteV3+V4+O2(OH)3Mon. 2/m : B2/m
4.HE.30DoloresiteV4+3O4(OH)4Mon. 2/m : B2/m
4.HE.35DuttoniteV4+O(OH)2Mon. 2/m
4.HE.40CavoiteCaV4+3O7Orth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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 MetahewettiteHide

References for MetahewettiteHide

Reference List:

Localities for MetahewettiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- 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.
Kazakhstan
 
  • Kyzylorda Region
    • Shieli District
Anthony (1997)
  • Turkistan Region
    • Aksumbe
Evseev (1995) +1 other reference
Kyrgyzstan
 
  • Batken Region
    • Kadamjay District
Karpenko et al. (2009)
USA
 
  • Arizona
    • Apache County
      • Black Mountain Mining District (Black Mesa Mining District)
        • Taasahdi Dzil
Peirce (1970) +1 other reference
Pierce (1970) +1 other reference
Peirce (1970) +1 other reference
Scarborough (1981)
Peirce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Peirce et al. (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Peirce et al. (1970) +1 other reference
Pierce (1970) +1 other reference
Peirce et al. (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
      • Cane Valley Mining District
        • Yazzie Mesa
          • Monument No. 2 channel
Rocks & Min.: 64:500. +3 other references
Chenoweth (1994)
      • Rough Rock Mining District
        • Rough Rock
Peirce et al. (1970) +1 other reference
Pierce (1970) +1 other reference
Pierce (1970) +1 other reference
    • Coconino County
      • Vermillion Cliffs Mining District
        • Marble Canyon
Barrett (1953) +1 other reference
    • Navajo County
Patrick Haynes. ID by the late Howard ...
    • Yavapai County
      • Bradshaw Mountains (Bradshaw Range)
        • Big Bug Mining District
          • Poland
MRDS database Dep. ID #10026929
  • Arkansas
    • Garland County
      • Wilson Springs (Potash Sulfur Springs)
Rocks & Min.: 63:108.
  • Colorado
    • Mesa County
      • Uravan Mining District
        • Calamity Mesa
Eckel et al. (1997)
    • Montrose County
      • Uravan Mining District
        • Paradox Valley
Min Rec (1993)
Palache et al. (1944)
    • San Miguel County
      • Bull Pen Canyon
Rocks & Minerals 80:5 pp358-359
      • Slick Rock Mining District
        • Carnation Mine Group (Rye No. 8)
Excalibur Mineral Co. sample and ...
In the collection of Alex Earl
Patrick Haynes (identified by me about 20 years ago)
  • Nevada
    • Eureka County
      • Gibellini Mining District
NBMG Bull 64 Geology and Mineral ...
[Anthony (1997) +1 other reference
        • Fish Creek Range
www.prophecydev.com (n.d.) +3 other references
Castor et al. (2004)
  • New Mexico
    • Cibola County
      • East Grants Ridge Mining District
NMBMMR Memoir 15 Geology and Technology ... +1 other reference
Northrop et al. (1996)
    • McKinley County
New Mexico Bureau of Mines and Mineral ...
    • San Juan County
      • Shiprock District
        • Eastside mines
NMBGMR Open-file Report - 466 +1 other reference
  • Oregon
dan weinrich
Mineralogical Society of America - ...
  • South Dakota
    • Fall River County
USGS Bull 1063D +4 other references
        • Craven Canyon
Roberts et al. (1965)
  • Utah
    • Emery County
      • San Rafael Swell Mining District
Bullock (1981)
DANA R. KELLEY AND PAUL F. KERR (1958)
Collected by and in the collection of ...
Bullock (1981)
Bullock (1981) +1 other reference
    • Garfield County
      • East Henry Mountains Mining District
Bullock (1981)
    • Grand County
      • Gateway Mining District
Am Min 16:273-277
Bullock (1981)
Hillebrand et al. (1914)
        • The Poison Strip
Am. Min. 48 (1963) +1 other reference
Bullock (1981)
        • Yellow Cat Mesa
Collected by and in the collection of ...
      • Yellow Cat Mining District
Bullock (1981)
    • San Juan County
      • La Sal Creek Mining District
Carter et al. (1965) +1 other reference
      • La Sal Mining District
Collected by and in the collection of ...
 
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