Metahewettite Mineral Data

General Metahewettite Information

Chemical Formula:

CaV6O16•3(H2O)

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

Empirical Formula:

CaV⁵⁺₆O₁₆•3(H₂O)

Environment:

Uranium-Vanadium sandstone deposits.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Minasragra, Peru. Link to MinDat.org Location Data.

Name Origin:

Named for its lower hydrate relationship to hewettite.

Name Pronunciation:

Metahewettite + Pronunciation

Metahewettite Image

Images:

Metahewettite

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

Axial Ratios:

a:b:c =3.3684:1:5.1122

Cell Dimensions:

a = 12.15, b = 3.607, c = 18.44, Z = 2; beta = 118.03° V = 713.34 Den(Calc)= 3.05

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m

Physical Properties of Metahewettite

Color:

Red.

Density:

2.5

Luminescence:

Non-fluorescent.

Luster:

Silky

Magnetism:

Nonmagnetic

Streak:

brownish red

Optical Properties of Metahewettite

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

Optical Data:

Biaxial (-), a=1.7, b=2.1, g=2.23, bire=0.5300

Calculated Properties of Metahewettite

Electron Density:

Bulk Density (Electron Density)=2.94 gm/cc
note: Specific Gravity of Metahewettite =3.05 gm/cc.

Fermion Index:

Fermion Index = 0.0014716431
Boson Index = 0.9985283569

Photoelectric:

PE_{Metahewettite}= 9.69 barns/electron
U=PE_{Metahewettite} x rElectron Density= 28.50 barns/cc.

Radioactivity:

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

Metahewettite Classification

Dana Class:

47.03.01.02 (47)Vanadium Oxysalts

(47.03)(Hydrated)

(47.03.01)Hewettite Group

47.03.01.01 Hewettite CaV6O16•9(H2O) P 2/m 2/m

47.03.01.02 Metahewettite CaV6O16•3(H2O) A2/m 2/m

47.03.01.03 Barnesite Na2V6O16•3(H2O) P 2/m 2/m

47.03.01.04 Hendersonite Ca1.3V6O16•6(H2O) Pnam 2/m 2/m 2/m

47.03.01.05 Grantsite Na4CaxV2xV12-2xO32•8(H2O) C 2/m 2/m

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

References:

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

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
15 - WWW-MINCRYST

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

Metahewettite

CaV6O16•3(H2O)
Dana No: 47.03.01.02 Strunz No: 04.HE.15
Locality:

Notes:

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