Mineralogy Database

Hewettite Mineral Data

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General Hewettite Information

Help on Chemical  Formula: Chemical Formula: CaV6O16•9(H2O)
Help on Composition: Composition: Molecular Weight = 763.85 gm
   Calcium    5.25 %  Ca    7.34 % CaO
   Vanadium  40.01 %  V    71.43 % V2O5
   Hydrogen   2.38 %  H    21.23 % H2O
   Oxygen    52.36 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaV5+6O16•9(H2O)
Help on Environment: Environment: Alteration product of patronite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1914
Help on Locality: Locality: Minasragra, 46 km from Cerro de Pasco, Peru. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Donnel Foster Hewett (1881-1971), geologist with the U.S. Geological Survey, who described the mineralogy of Minasragra, Peru.
Help on Name Pronunciation: Name Pronunciation: Hewettite + Pronunciation Say HEWETTITE
Help on Synonym: Synonym: ICSD 203169
  PDF 35-564

Hewettite Image

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  Fervanite   Hewettite

Comments: Spherical aggregate of acicular microcrystals of fervanite with blocky hewettite.
Location: Gold Quarry Mine, Carlin Trend, Eureka County, Nevada, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

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Comments: Red sub-metallic fibrous mats of hewettite on matrix.
Location: Cactus Rat Mine, Thompson's District, Grand Count, Utah, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hewettite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =3.503:1:3.1953
Help on Cell Dimensions: Cell Dimensions: a = 12.25, b = 3.497, c = 11.174, Z = 1; beta = 97.25° V = 474.85 Den(Calc)= 2.67
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 11.03(1), 5.53(0.35), 2.1636(0.25),

Physical Properties of Hewettite

Help on Color: Color: Red.
Help on Density: Density: 2.5 - 2.6, Average = 2.54
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
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 Hewettite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.315 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.256 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.4151,KPDmeas= 0.4346,KC= 0.3305
Ncalc = 1.83 - 1.88
Help on Optical Data: Optical Data: Biaxial (-), a=1.77, b=2.18, g=2.35-2.4, bire=0.5800-0.6300

Calculated Properties of Hewettite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.63 gm/cc
note: Specific Gravity of Hewettite =2.67 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0013260922
Boson Index = 0.9986739078
Help on Photoelectric: Photoelectric: PEHewettite = 8.20 barns/electron
U=PEHewettite x rElectron Density= 21.57 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hewettite is Not Radioactive

Hewettite 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 Hewettite 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 Hewettite :
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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