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Sherwoodite

Formula:
Ca
 
9
Al
 
2
V
 
4
V
 
24
O
 
80
·56H
 
2
O
System:TetragonalColour:Dark bluish black ...
Hardness:2
Name:For A. M. Sherwood.

Classification of Sherwoodite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:4/G.01-40
Nickel-Strunz 10th (pending) edition ID:4.HC.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
H : V[5,6] Vanadates
C : [6]-Sorovanadates
Dana 8th edition ID:47.2.4.1

47 : VANADIUM OXYSALTS
2 : Anhydrous Vanadium Oxysalts Containing Hydroxyl or Halogen
Hey's CIM Ref.:21.2.9

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

Type Locality:Peanut Mine, Bull Canyon, Uravan District, Montrose Co., Colorado, USA
Year of Discovery:1958

Physical Properties of Sherwoodite

Lustre:Vitreous, Earthy
Colour:Dark bluish black (fresh), blue-green, yellow-green (altered)
Hardness (Mohs):2

Crystallography of Sherwoodite

Crystal System:Tetragonal
Cell Parameters:a = 28.13Å, c = 13.44Å
Ratio:a:c = 1 : 0.478
Unit Cell Volume:V 10,635.03 ų (Calculated from Unit Cell)

Optical Data of Sherwoodite

Type:Uniaxial (-)
RI values: nω = 1.765 nε = 1.735
Maximum Birefringence:δ = 0.030

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High

Chemical Properties of Sherwoodite

Formula:
Ca
 
9
Al
 
2
V
 
4
V
 
24
O
 
80
·56H
 
2
O
Essential elements:Al, Ca, H, O, V
All elements listed in formula:Al, Ca, H, O, V

Relationship of Sherwoodite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.HC.05Pascoite
Ca
 
3
[V
 
10
O
 
28
] · 17H
 
2
O
4.HC.05Lasalite
Na
 
2
Mg
 
2
[V
 
10
O
 
28
] · 20H
 
2
O
4.HC.10Hummerite
K
 
2
Mg
 
2
[V
 
10
O
 
28
] · 16H
 
2
O
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
21.2.3Metahewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
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
21.2.10Melanovanadite
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 Sherwoodite

Other Languages:
German:Sherwoodit
Russian:Шервудит
Spanish:Sherwoodita

Other Information

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 Sherwoodite

Reference List:American Mineralogist (1958): 43: 749-755.

American Mineralogist (1978): 63: 863-868.

Internet Links for Sherwoodite

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  • Raman and XRD data at RRUFF project
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    Localities for Sherwoodite

    The 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.
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    USA
     
    • Arizona
      • Apache Co.
        • Lukachukai Mts
    Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 370.
    • Colorado
      • Mesa Co.
        • Uravan District
          • Calamity Mesa
    Minerals of Colorado (1997) E.B. Eckels
          • Bull Canyon
    Amer.Min.(1958) 43, 749-755; "Minerals of Colorado, updated & revised", p. 435, by Eckel, Edwin B., 1997
          • Paradox Valley
    Minerals of Colorado 2nd ed.
    Minerals of Colorado (1997) E.B. Eckels
      • San Miguel Co.
        • Lower San Miguel District
    Minerals of Colorado (1997) E.B. Eckels
    • New Mexico
      • San Juan Co.
    Northrop, Minerals of New Mexico, 3rd. Rev. Ed., 1996
    Minerals of New Mexico 3rd ed.
    Minerals of New Mexico 3rd ed.
    • Utah
      • Grand Co.
        • Wilson Mesa
    UGMS Bull 117 Minerals and Mineral Localities of Utah
      • San Juan Co.
        • La Sal Quadrangle
    Can. Min. (2001) 39, 6, 1691-1700
        • Paradox Valley
          • Paradox Valley District
    Can.Min. 46,687-692(2008)
    Mineral and/or Locality
    Google
     
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    Copyright © Jolyon Ralph and Ida Chau 1993-2009. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 9th Nov 2009 22:39:04