Mineralogy Database

Metahewettite Mineral Data

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General Metahewettite Information

Help on Chemical  Formula: Chemical Formula: CaV6O16•3(H2O)
Help on Composition: Composition: Molecular Weight = 655.76 gm
   Calcium    6.11 %  Ca    8.55 % CaO
   Vanadium  46.61 %  V    83.21 % V2O5
   Hydrogen   0.92 %  H     8.24 % H2O
   Oxygen    46.36 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaV5+6O16•3(H2O)
Help on Environment: Environment: Uranium-Vanadium sandstone deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Minasragra, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for its lower hydrate relationship to hewettite.
Help on Name Pronunciation: Name Pronunciation: Metahewettite + Pronunciation Say METAHEWETTITE

Metahewettite Image

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Comments: Deep red, vibrant, radial micro crystals of metahewettite to 3mm in diameter on matrix.
Location: Cactus Rat mine, Grand County, Utah. Scale: 4 x 4 x 2 cm.
© John Veevaert

Metahewettite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.3684:1:5.1122
Help on Cell Dimensions: Cell Dimensions: a = 12.15, b = 3.607, c = 18.44, Z = 2; beta = 118.03° V = 713.34 Den(Calc)= 3.05
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m

Physical Properties of Metahewettite

Help on Color: Color: Red.
Help on Density: Density: 2.5
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Silky
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: brownish red

Optical Properties of Metahewettite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.228 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3311,KPDmeas= 0.404,KC= 0.3289
Ncalc = 1.82 - 2
Help on Optical Data: Optical Data: Biaxial (-), a=1.7, b=2.1, g=2.23, bire=0.5300

Calculated Properties of Metahewettite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Metahewettite =3.05 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0014716431
Boson Index = 0.9985283569
Help on Photoelectric: Photoelectric: PEMetahewettite = 9.69 barns/electron
U=PEMetahewettite x rElectron Density= 28.50 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Metahewettite is Not Radioactive

Metahewettite Classification

Help on  Dana Class: Dana Class: (47)Vanadium Oxysalts
  (47.03.01)Hewettite Group Hewettite CaV6O16•9(H2O) P 2/m 2/m Metahewettite CaV6O16•3(H2O) A2/m 2/m Barnesite Na2V6O16•3(H2O) P 2/m 2/m Hendersonite Ca1.3V6O16•6(H2O) Pnam 2/m 2/m 2/m Grantsite Na4CaxV2xV12-2xO32•8(H2O) C 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.HE.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.H - V[5,6] Vanadates
  04.HE -Phyllovanadates
04.HE.15 Hewettite CaV6O16•9(H2O) P 2/m 2/m
04.HE.15 Metahewettite CaV6O16•3(H2O) A2/m 2/m

Other Metahewettite Information

Help on References: References: 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 Metahewettite :
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

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Dana No: Strunz No: 04.HE.15





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