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Sherwoodite

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Foster, Gateway District, Grand Co., Utah, USA
© JM 2011

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Formula:
Ca
 
4.5
(AlV
4+
2
V
5+
12
O
 
40
) · 28H
 
2
O
System:TetragonalColour:Dark bluish black ...
Hardness:2
Name:For Alexander M. Sherwood (b. 1888), an analytical chemist of the United States Geological Survey (USGS).


This mineral contains aluminovanadate(IV,V) polyanions, consisting of 14 (VO6) octahedra condensed by edge-sharing around a central (AlO6) octahedron (Evans and Konnert, 1978).

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
 
4.5
(AlV
4+
2
V
5+
12
O
 
40
) · 28H
 
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.05Magnesiopascoite
Ca
 
2
Mg(V
 
10
O
 
28
) · 16H
 
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
CaV
 
6
O
 
16
 · 3H
 
2
O
21.2.4Hewettite
CaV
 
6
O
 
16
 · 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
(V
 
2
O
 
7
) · 9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
1.3
V
 
6
O
 
16
 · 6H
 
2
O
21.2.7Fernandinite
(Ca,K)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 10H
 
2
O
21.2.8Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
21.2.10Melanovanadite
Ca
 
2
(V
5+
 
,V
4+
 
)
 
4
O
 
10
 · 5H
 
2
O
21.2.11Grantsite
(Na,Ca)V
 
6
O
 
16
 · 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
(V
 
10
O
 
28
) · 16H
 
2
O
21.2.13Metadelrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
21.2.14Delrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
 · 3H
 
2
O
21.2.15Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
8
O
 
20
 · 3H
 
2
O
21.2.16Gamagarite
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)

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:

- +
Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): Sherwoodite, a mixed vanadium(IV)-vanadium(V) mineral from the Colorado Plateau. American Mineralogist 43, 749-755.

Evans, Jr., H.T., and Konnert, J.A. (1978): The crystal chemistry of sherwoodite, a calcium l4-vanadoaluminate heteropoly complex. American Mineralogist 63, 863-868.

Internet Links for Sherwoodite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Sherwoodite details from Handbook of Mineralogy (PDF)
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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.
    Hide Locality List
    (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
    		Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
      • Montrose Co.
        • Uravan District
          • Bull Canyon
    		Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
          • Paradox Valley
    		Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
    Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
    Minerals of Colorado (1997) E.B. Eckels
      • San Miguel Co.
        • Lower San Miguel District
    		Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
        • Uravan District
          • Carnation Mine group
    		Excalibur Mineral Co. sample and analysis
    Collected by and in the collection of Brent Thorne.
    • New Mexico
      • San Juan Co.
        • Shiprock District
          • Eastside mines
    		NMBGMR Open-file Report - 466
    Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
    • Utah
      • Grand Co.
        • Polar Mesa District (Polar Mesa)
    		Collected by and in the collection of Brent Thorne.
        • Wilson Mesa
    		Thompson, M.E., Roach, C.H., and Meyrowitz, R. (1958): American Mineralogist 43, 749-755
      • San Juan Co.
        • La Sal Quadrangle
    		Can. Min. (2001) 39, 6, 1691-1700
        • Paradox Valley
          • Paradox Valley District
    		Can.Min. 46,687-692(2008)
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