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Sherwoodite

Big Photo

Montrose Co., Colorado, USA
© Brent Thorne

Show Sherwoodite Photos (4)
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.


Pascoite-Sherwoodite Group .

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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    Localities for Sherwoodite

    Hide Locality List
    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
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