Sherwoodite Mineral Data

Sherwoodite Mineral Data
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General Sherwoodite Information

Help on Chemical Formula: Chemical Formula: Ca9Al2V++++4V+++++24O80•56(H2O)
Help on Composition: Composition: Molecular Weight = 4,129.83 gm
   Calcium    8.73 %  Ca   12.22 % CaO
   Aluminum   1.31 %  Al    2.47 % Al2O3
   Vanadium  34.54 %  V    61.66 % V2O5
   Hydrogen   2.73 %  H    24.43 % H2O
   Oxygen    52.69 %  O
            ______        ______ 
            100.00 %      100.77 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca9Al2V5+4V5+24O80•56(H2O)
Help on Environment: Environment: Oxidation product of lower valent vanadium minerals, on fracture surfaces and replacing fossil wood in Colorado Plateau-type U–V deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1958
Help on Locality: Locality: Peanut and Jo Dandy mines, Bull Canyon district, Uravan district, Montrose Co., Colorado, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Alexander M. Sherwood (1888-?), American analytical chemist, U.S. Geological Survey.
Help on Name Pronunciation: Name Pronunciation: Sherwoodite + Pronunciation Say SHERWOODITE
Help on Synonym: Synonym: ICSD 100660
  PDF 11-191
 

Sherwoodite Image

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Sherwoodite

Comments: Dark blackish-violet sherwoodite, altering to translucent green, crystalline crust.
Location: San Juan County, Colorado, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Sherwoodite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.48325
Help on Cell Dimensions: Cell Dimensions: a = 28.06, c = 13.56, Z = 4; V = 10,676.65 Den(Calc)= 2.57
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 10(1), 12.3(1), 9.3(0.8),
Click Here for Large Sherwoodite Structure Window Crystal Structure:

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Evans H T , Konnert J A , American Mineralogist , 63 (1978) p.863-868, The crystal chemistry of sherwoodite, a calcium 14-vanadoaluminate heteropoly, complex

 

Physical Properties of Sherwoodite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue green, Yellow green, Dark blue black.
Help on Density: Density: 2.8
Help on Fracture: Fracture: Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: light blue
 

Optical Properties of Sherwoodite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.172 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.098 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2918,KPDmeas= 0.2679,KC= 0.3235
Ncalc = 1.83 - 1.91
Help on Optical Data: Optical Data: Uniaxial (-), e=1.735, w=1.765, bire=0.0300.
 

Calculated Properties of Sherwoodite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Sherwoodite =2.57 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0012383612
Boson Index = 0.9987616388
Help on Photoelectric: Photoelectric: PESherwoodite = 7.60 barns/electron
U=PESherwoodite x rElectron Density= 19.39 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sherwoodite is Not Radioactive
 

Sherwoodite Classification
Help on Dana Class: Dana Class: 47.02.04.01 (47)Vanadium Oxysalts
  (47.02)(VmOn)
  (47.02.04)Dana Group
 
47.02.04.01 Sherwoodite Ca9Al2V4V24O80•56(H2O) I 41/amd 4/m 2/m 2/m
Help on Strunz Class: Strunz Class: 04.HC.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HC -[6]-Sorovanadates
 
04.HC.15 Sherwoodite Ca9Al2V4V24O80•56(H2O) I 41/amd 4/m 2/m 2/m
 

Other Sherwoodite Information
Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Sherwoodite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Sherwoodite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

Print or Cut-and-Paste your Sherwoodite Specimen Label here :

Sherwoodite

Ca9Al2V++++4V+++++24O80•56(H2O)
Dana No: 47.02.04.01 Strunz No: 04.HC.15
Locality:

 

Notes: