Sherwoodite Mineral Data

General Sherwoodite Information

Chemical Formula:

Ca9Al2V++++4V+++++24O80•56(H2O)

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

Empirical Formula:

Ca₉Al₂V⁵⁺₄V⁵⁺₂₄O₈₀•56(H₂O)

Environment:

Oxidation product of lower valent vanadium minerals, on fracture surfaces and replacing fossil wood in Colorado Plateau-type U–V deposits.

IMA Status:

Valid Species (Pre-IMA) 1958

Locality:

Peanut and Jo Dandy mines, Bull Canyon district, Uravan district, Montrose Co., Colorado, USA. Link to MinDat.org Location Data.

Name Origin:

Named for Alexander M. Sherwood (1888-?), American analytical chemist, U.S. Geological Survey.

Name Pronunciation:

Sherwoodite + Pronunciation

Synonym:

ICSD 100660

PDF 11-191

Sherwoodite Image

Images:

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

Axial Ratios:

a:c = 1:0.48325

Cell Dimensions:

a = 28.06, c = 13.56, Z = 4; V = 10,676.65 Den(Calc)= 2.57

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/I_o): 10(1), 12.3(1), 9.3(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Cleavage:

None

Color:

Blue green, Yellow green, Dark blue black.

Density:

2.8

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

2 - Gypsum

Luster:

Vitreous - Dull

Streak:

light blue

Optical Properties of Sherwoodite

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

Optical Data:

Uniaxial (-), e=1.735, w=1.765, bire=0.0300.

Calculated Properties of Sherwoodite

Electron Density:

Bulk Density (Electron Density)=2.55 gm/cc
note: Specific Gravity of Sherwoodite =2.57 gm/cc.

Fermion Index:

Fermion Index = 0.0012383612
Boson Index = 0.9987616388

Photoelectric:

PE_Sherwoodite= 7.60 barns/electron
U=PE_Sherwoodite x rElectron Density= 19.39 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sherwoodite is Not Radioactive

Sherwoodite Classification

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

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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

Search for Sherwoodite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Sherwoodite :

A Bijoux Google Search for Sherwoodite
Adam's Minerals Google Search for Sherwoodite
Cape Minerals Google Search for Sherwoodite
Dakota Matrix Minerals Google Search for Sherwoodite
Excalibur Mineral Corp. Google Search for Sherwoodite
Exceptional Minerals Google Search for Sherwoodite
John Betts Fine Minerals Search for Sherwoodite
McDougall Minerals Google Search for Sherwoodite
Mineral News Website Link
Rock and Mineral Shows Google Search for Sherwoodite
Weinrich Minerals, Inc. Google Search for Sherwoodite

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: