Metahewettite Mineral Data

Metahewettite Mineral Data +

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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.

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 - PrismaticH-M Symbol (2/m) Space Group: A2/m

Crystal Structure:

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Bachmann H G , Barnes W H , The Canadian Mineralogist , 7 (1962) p.219-235, The crystal structure of a sodium-calcium variety of metahewettite, Sample: anhydrous

View Additional jPOWD Structure files for Metahewettite
[1]

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

Optical Data:

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

Calculated Properties of Metahewettite

Electron Density:

r_electron=2.94 gm/cc
note: r_{Metahewettite}=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00147
Boson Index = 0.99853

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Metahewettite is Not Radioactive

Metahewettite Classification

Dana Class:

47.3.1.2 (47)Vanadium Oxysalts

(47.3)(Hydrated)

(47.3.1)Dana Group

47.3.1.1 Hewettite CaV6O16·9(H2O) P 2/m 2/m

47.3.1.2 Metahewettite CaV6O16·3(H2O) A2/m 2/m

47.3.1.3 Barnesite Na2V6O16·3(H2O) P 2/m 2/m

47.3.1.4 Hendersonite Ca1.3V6O16·6(H2O) Pnam 2/m 2/m 2/m

47.3.1.5 Grantsite Na4CaxV2xV12-2xO32·8(H2O) C 2/m 2/m

Strunz Class:

IV/G.12-50 IV - Oxides

IV/G - Vanadiumoxides (with V4+/5+) Layered vanadates. Typical Vanadiumbronzes

IV/G.12 - Barnessite - Metahewettite series

IV/G.12-10 Barnesite Na2V6O16·3(H2O) P 2/m 2/m

IV/G.12-20 Grantsite Na4CaxV2xV12-2xO32·8(H2O) C 2/m 2/m

IV/G.12-30 Hendersonite Ca1.3V6O16·6(H2O) Pnam 2/m 2/m 2/m

IV/G.12-40 Hewettite CaV6O16·9(H2O) P 2/m 2/m

IV/G.12-50 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Metahewettite

CaV6O16·3(H2O)
Dana No: 47.3.1.2 Strunz No: IV/G.12-50
Locality:

Notes: