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Metahewettite

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Jo Dandy Mine (Paradox D; Hummer; C; Blackburn; Yellow Bird No. 1; Oversight; Broker), Paradox Valley, Uravan District, Montrose Co., Colorado, USA
© Brent Thorne

Show Metahewettite Photos (9)
Formula:
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
System:MonoclinicColour:Deep red; red to orange ...
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.

Classification of Metahewettite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/G.12-50
Nickel-Strunz 10th (pending) edition ID:4.HE.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
E : Phyllovanadates
Dana 8th edition ID:47.3.1.2

47 : VANADIUM OXYSALTS
3 : Hydrated Normal Vanadium Oxysalts
Hey's CIM Ref.:21.2.3

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

Type Locality:Thompsons District (S. E. Thomsons), Grand Co., Utah, USA
General Appearance of Type Material:Impregnations
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.
Year of Discovery:1914
Geological Setting of type material:Colorado Plateau-type U-V deposit.

Occurrences of Metahewettite

Geological Setting:Colorado Plateau-type U-V deposits.

Physical Properties of Metahewettite

Lustre:Silky, Dull
Diaphaneity (Transparency):Translucent
Colour:Deep red; red to orange in transmittedlight
Streak:Maroon to brownish red
Comment:Soft
Density (measured):2.51 - 2.94 g/cm3
Density (calculated):3.05 g/cm3
Comment:Measured values are for material with 9H2O and 3H2O, respectively

Crystallography of Metahewettite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Cell Parameters:a = 12.15Å, b = 3.607Å, c = 18.44Å
β = 118.03°
Ratio:a:b:c = 3.368 : 1 : 5.112
Unit Cell Volume:V 713.34 ų (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 57°; in parallel or radial-fibrous masses; pulverulent; coatings.
Comment:Space Group = A2/m

Optical Data of Metahewettite

Type:Biaxial (-)
RI values: nα = 1.700 nβ = 2.100 nγ = 2.230
2V:Calculated: 52°
Maximum Birefringence:δ = 0.530

Chart 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.

Chemical Properties of Metahewettite

Formula:
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
Essential elements:Ca, H, O, V
All elements listed in formula:Ca, H, O, V

Relationship of Metahewettite to other Species

Common Associates:
SeleniumHewettiteGypsum
Related Minerals - Nickel-Strunz Grouping):

- +
4.HE.05Melanovanadite
Ca
 
2
V
 
4
V
 
6
O
 
25
·nH
 
2
O
4.HE.10Shcherbinaite
V
 
2
O
 
5
4.HE.15Hewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 9H
 
2
O
4.HE.20Bariandite
Al
 
3
[(V
5+
 
,V
4+
 
)
 
4
O
 
10
]
 
10
 · 45H
 
2
O
4.HE.20Bokite
(Al,Fe
3+
 
)
 
1.3
[(V
5+
 
,V
4+
 
,Fe
3+
 
)
 
4
O
 
10
]
 
2
 · 7.5H
 
2
O
4.HE.20Corvusite
V
 
7
O
 
20
·nH
 
2
O
4.HE.20Fernandinite
(Ca,K)[(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
4
O
 
10
]
 
2
 · 4H
 
2
O
4.HE.20Straczekite
(Ca,K,Ba)V
 
8
O
 
20
·3H
 
2
O
4.HE.25Häggite
V
 
2
O
 
2
(OH)
 
3
4.HE.30Doloresite
3V
 
2
O
 
4
·4H
 
2
O
4.HE.35Duttonite
VO(OH)
 
2
4.HE.40Cavoite
CaV
 
3
O
 
7
Related Minerals - Hey's Index Grouping:

- +
21.2.1Metarossite
Ca[V
 
2
O
 
6
] · 2H
 
2
O
21.2.2Rossite
Ca[V
 
2
O
 
6
] · 4H
 
2
O
21.2.4Hewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
V
 
2
O
 
7
·9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
x
(V
5+
 
,V
4+
 
)
 
12
O
 
32
·12H
 
2
O (x about 2.6)
21.2.7Fernandinite
(Ca,K)[(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
4
O
 
10
]
 
2
 · 4H
 
2
O
21.2.8Pascoite
Ca
 
3
[V
 
10
O
 
28
] · 17H
 
2
O
21.2.9Sherwoodite
Ca
 
9
Al
 
2
V
 
4
V
 
24
O
 
80
·56H
 
2
O
21.2.10Melanovanadite
Ca
 
2
V
 
4
V
 
6
O
 
25
·nH
 
2
O
21.2.11Grantsite
(Na
 
2
,Ca)[V
 
2
O
 
6
|(V
5+
 
,V
4+
 
)
 
4
O
 
10
] · 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
[V
 
10
O
 
28
] · 16H
 
2
O
21.2.13Metadelrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
]
21.2.14Delrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
] · 3H
 
2
O
21.2.15Straczekite
(Ca,K,Ba)V
 
8
O
 
20
·3H
 
2
O
21.2.16Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]

Other Names for Metahewettite

Other Languages:
German:Metahewettit
Russian:Метахьюэттит
Spanish:Metahewettita

Other Information

Other Information:Reversibly hydrates to Hewettite. Slightly soluble in water.
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Metahewettite

Reference List:Hillebrand, Merwin, and Wright (1914) Proceedings of the American Philosophical Society: 53: 31.

Hillebrand, Merwin, and Wright (1914) Zeitschrift für Kristallographie, Mineralogie und Petrographie, Leipzig: 54: 209.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 1061-1062.

Bayliss, P. (1979) X-ray powder data for metahewettite. Mineralogical Magazine, 43, 550.

Bayliss, P. (1982) X-ray powder data for hewettite. Mineralogical Magazine, 46,
503–504.

Evans, H.T., Jr. and J.M. Hughes (1990) Crystal chemistry of the natural vanadium
bronzes. American Mineralogist: 75: 508-521.

Internet Links for Metahewettite

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    Localities for Metahewettite

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