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Vigezzite Mineral Data

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General Vigezzite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Ce)(Nb,Ta,Ti)2O6
Help on Composition: Composition: Molecular Weight = 372.21 gm
   Calcium    8.61 %  Ca   12.05 % CaO
   Cerium     7.53 %  Ce    8.82 % Ce2O3
   Tantalum  29.17 %  Ta   35.62 % Ta2O5
   Titanium   6.43 %  Ti   10.73 % TiO2
   Niobium   22.46 %  Nb   32.14 % Nb2O5
   Oxygen    25.79 %  O
            ______        ______ 
            100.00 %       99.36 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.8Ce0.2Nb0.9Ta0.6Ti0.5O6
Help on Environment: Environment: Miarolitic cavities in an albitized pegmatite in amphibolite and biotite gneiss.
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Orcesco, on Alpe Rosso, Val Vigezzo, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Vigezzite + Pronunciation Say VIGEZZITE
Help on Synonym: Synonym: ICSD 69217
  PDF 34-1316

Vigezzite Image

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Comments: Translucent brown vigezzite microcrystal in marble.
Location: Alpe Rosso, Val Vigezzo, Orcesco, Novara, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Vigezzite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6854:1:0.486
Help on Cell Dimensions: Cell Dimensions: a = 7.559, b = 11.028, c = 5.36, Z = 4; V = 446.81 Den(Calc)= 5.53
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pmnb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.974(1), 3.03(1), 4.821(0.9),

Physical Properties of Vigezzite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Orange, Bright yellow orange.
Help on Density: Density: 5.54
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 4.5-5 - Near Apatite
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: white

Optical Properties of Vigezzite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.222,KPDmeas= 0.2216,KC= 0.2201
Ncalc = 2.22
Help on Optical Data: Optical Data: Biaxial (+), a=2.14, g=2.315, bire=0.1750, 2V(Meas)=large. Dispersion extreme.

Calculated Properties of Vigezzite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.98 gm/cc
note: Specific Gravity of Vigezzite =5.54 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0085915604
Boson Index = 0.9914084396
Help on Photoelectric: Photoelectric: PEVigezzite = 410.44 barns/electron
U=PEVigezzite x relectron=2,044.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7,219.41 (Gamma Ray American Petroleum Institute Units)
Concentration of Vigezzite per GRapi unit = 138.52 (PPM)

Vigezzite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Radioactivity from Vigezzite - mild
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.01 cm 168,647 4.56E-06 7,219.41 2.37
100 gm / 3.25 cm 16,865 4.56E-07 721.94 0.24
10 gm / 1.51 cm 1,686 4.56E-08 72.19 0.02
1 gm / 7.01 mm 169 4.56E-09 7.22 0.00
0.1 gm / 3.25 mm 17 4.56E-10 0.72 0.00
0.01 gm / 1.51 mm 2 4.56E-11 0.07 0.00
0.001 gm / 0.70 mm 0 4.56E-12 0.01 0.00

Weight of pure Vigezzite in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.54 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 0.38 % Th) From Sum REE Elements ( 7.53 % REE)

Vigezzite Classification

Help on  Dana Class: Dana Class: (08)Multiple Oxides with Nb, Ta, and Ti
  (08.03)where A (B2O6)
  (08.03.07)Dana Group Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DF.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DF -With large (� medium-sized) cations; dimers and trimers of edge-sharing octahedra
04.DF.05 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m
04.DF.05 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m
04.DF.05 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m
04.DF.05 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m
04.DF.05 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m
04.DF.05 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m
04.DF.05 Nioboaeschynite-(Y)! [(Y,REE),Ca,Th,Fe](Nb,Ti,Ta)2(O,OH)6 Pbnm 2/m 2/m 2/m

Other Vigezzite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Vigezzite :
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.DF.05





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