Vigezzite Mineral Data

Vigezzite Mineral Data +

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General Vigezzite Information

Chemical Formula:

(Ca,Ce)(Nb,Ta,Ti)2O6

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

Empirical Formula:

Ca_0.8Ce_0.2Nb_0.9Ta_0.6Ti_0.5O₆

Environment:

Miarolitic cavities in an albitized pegmatite in amphibolite and biotite gneiss.

IMA Status:

Approved IMA 1979

Locality:

Orcesco, on Alpe Rosso, Val Vigezzo, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 69217

PDF 34-1316

Vigezzite Image

Images:

Vigezzite

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

Axial Ratios:

a:b:c =0.6854:1:0.486

Cell Dimensions:

a = 7.559, b = 11.028, c = 5.36, Z = 4; V = 446.81 Den(Calc)= 5.53

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmnb

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.974(1), 3.03(1), 4.821(0.9),

Crystal Structure:

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Giuseppetti G , Tadini P , Neues Jahrbuch fur Mineralogie, Monatshefte , 1990 (1990) p.301-308, The crystal structure of vigezzite, (Ca,Ce)(Nb,Ta,Ti)2O6,, intermediate term of the aeschynite series, Locality: Vigezzo Valley, Novara, Italy

Physical Properties of Vigezzite

Cleavage:

[100] Distinct

Color:

Orange, Bright yellow orange.

Density:

5.54

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

4.5-5 - Near Apatite

Luster:

Sub Metallic

Streak:

white

Optical Properties of Vigezzite

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

Optical Data:

Biaxial (+), a=2.14, g=2.315, bire=0.1750, 2V(Meas)=large. Dispersion extreme.

Calculated Properties of Vigezzite

Electron Density:

r_electron=4.98 gm/cc
note: r_Vigezzite=5.54 gm/cc.

Fermion Index

Fermion Index = 0.00859
Boson Index = 0.99141

Photoelectric:

PE_Vigezzite= 410.44 barns/electron
U=PE_Vigezzite x r_electron=2,044.09 barns/cc.

Radioactivity:

GRapi = 7,219.41 (Gamma Ray American Petroleum Institute Units)

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

**Estimated Radioactivity from Vigezzite** - mild
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Bequerols (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr 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

Dana Class:

8.3.7.1 (8)Multiple Oxides with Nb, Ta, and Ti

(8.3)where A (B2O6)

(8.3.7)Dana Group

8.3.7.1 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m

8.3.7.2 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m

Strunz Class:

IV/D.21-40 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.21 - Aeschynite series

IV/D.21-10 Aeschynite-(Y) (Y,Ca,Fe)(Ti,Nb)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-20 Aeschynite-(Ce) (Ce,Ca,Fe)(Ti,Nb)2(O,OH)6 Pmnb 2/m 2/m 2/m

IV/D.21-30 Aeschynite-(Nd) (Nd,Ce)(Ti,Nb)2(O,OH)6 Pmnb ? 2/m 2/m 2/m

IV/D.21-40 Vigezzite (Ca,Ce)(Nb,Ta,Ti)2O6 Pmnb 2/m 2/m 2/m

IV/D.21-50 Niobo-aeschynite-(Ce) (Ce,Ca)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-60 Niobo-aeschynite-(Nd)! (Nd,Ce)(Nb,Ti)2(O,OH)6 Pbnm 2/m 2/m 2/m

IV/D.21-70 Rynersonite Ca(Ta,Nb)2O6 Pmnb 2/m 2/m 2/m

IV/D.21-80 Tantalaeschynite-(Y) (Y,Ce,Ca)(Ta,Ti,Nb)2O6 Pbnm 2/m 2/m 2/m

Other Vigezzite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Vigezzite :
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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Vigezzite

(Ca,Ce)(Nb,Ta,Ti)2O6
Dana No: 8.3.7.1 Strunz No: IV/D.21-40
Locality:

Notes: