Vicanite-(Ce) Mineral Data (original) (raw)

General Vicanite-(Ce) Information

Help on Chemical Formula: Chemical Formula:

(Ca,Ce,La,Th)15As+++++(As+++0.5,Na0.5)Fe+++Si6B4O40F7

Help on Composition: Composition:

Molecular Weight = 2,554.77 gm

Sodium 0.45 % Na 0.61 % Na2O

Calcium 12.55 % Ca 17.56 % CaO

Lanthanum 13.59 % La 15.94 % La2O3

Cerium 19.20 % Ce 22.48 % Ce2O3

Thorium 9.08 % Th 10.34 % ThO2

Iron 2.19 % Fe 3.13 % Fe2O3

Silicon 6.60 % Si 14.11 % SiO2

Boron 1.69 % B 5.45 % B2O3

Arsenic 4.40 % As 1.94 % As2O3 / 4.50 % As2O5

Oxygen 25.05 % O

Fluorine 5.21 % F 5.21 % F

- % F -2.19 % -O=F2

______ ______

100.00 % 99.06 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula:

Ca8Ce3.5La2.5ThAsAs0.5Na0.5Fe3+Si6B4O40F7

Help on Environment: Environment:

Inside a volcanic ejectum from a pyroclastic formation.

Help on IMA Status: IMA Status:

Approved IMA 1995

Help on Locality: Locality:

Vican (Vico lake) volcanic complex at Tre Croci, Ventralla (north of Rome), Latium, Veterbo provicne, Italy. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin:

After its locality.

Help on Name Pronunciation: Name Pronunciation:

Vicanite-(Ce) Say VICANITE-(CE)

Help on Synonym: Synonym:

IMA1991-050

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Vicanite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios:

a:c = 1:2.53228

Help on Cell Dimensions: Cell Dimensions:

a = 10.795, c = 27.336, Z = 3; V = 2,758.74 Den(Calc)= 4.61

Help on Crystal System: Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

Help on X Ray Diffraction: X Ray Diffraction:

By Intensity(I/Io): 2.993(1), 2.95(0.7), 7.7(0.5),

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| | Ballirano P , Callegari A , Caucia F , Maras A , Mazzi F , Ungaretti L , American Mineralogist , 87 (2002) p.1139-1143, The crystal structure of vicanite - (Ce), a borosilicate showing an unusual, (Si3B3O18) polyanion | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

Physical Properties of Vicanite-(Ce)

Help on Cleavage: Cleavage:

None

Help on Color: Color:

Yellow green, Green.

Help on Density: Density:

4.73

Help on Diaphaneity: Diaphaneity:

Transparent

Help on Fracture: Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Help on Habit: Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Help on Habit: Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Help on Hardness: Hardness:

5.5-6 - Knife Blade-Orthoclase

Help on Luminescence: Luminescence:

Non-fluorescent.

Help on Luster: Luster:

Vitreous - Adamantine

Help on Streak: Streak:

white

Optical Properties of Vicanite-(Ce)

Help on Dichroism (e): Dichroism (e):

colorless.

Help on Dichroism (w): Dichroism (w):

colorless.

Help on Gladstone-Dale: Gladstone-Dale:

CI meas= 0.114 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.091 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1604,KPDmeas= 0.1563,KC= 0.1765
Ncalc = 1.81 - 1.83

Help on Optical Data: Optical Data:

Uniaxial (-), e=1.722, w=1.757, bire=0.0350.

Calculated Properties of Vicanite-(Ce)

Help on Electron Density: Electron Density:

Bulk Density (Electron Density)=4.20 gm/cc
note: Specific Gravity of Vicanite-(Ce) =4.61 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.0073239745
Boson Index = 0.9926760255

Help on Photoelectric: Photoelectric:

PEVicanite-(Ce) = 377.04 barns/electron
U=PEVicanite-(Ce) x relectron=1,583.18 barns/cc.

Help on Radioactivity: Radioactivity:

GRapi = 176,486.16 (Gamma Ray American Petroleum Institute Units)
Concentration of Vicanite-(Ce) per GRapi unit = 5.67 (PPM)

Vicanite-(Ce) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size(10 mRem/hr limit, Unshielded 10 cm box) 172.35 ± 43.09 grams of pure Vicanite-(Ce) .

Estimated Radioactivity from Vicanite-(Ce) - strong

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.45 cm 4,068,979 1.10E-04 176,486.16 58.02
100 gm / 3.46 cm 406,898 1.10E-05 17,648.62 5.80
10 gm / 1.61 cm 40,690 1.10E-06 1,764.86 0.58
1 gm / 7.45 mm 4,069 1.10E-07 176.49 0.06
0.1 gm / 3.46 mm 407 1.10E-08 17.65 0.01
0.01 gm / 1.61 mm 41 1.10E-09 1.76 0.00
0.001 gm / 0.75 mm 4 1.10E-10 0.18 0.00

Weight of pure Vicanite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.61 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

Vicanite-(Ce) Classification

Help on Dana Class: Dana Class:

54.03.01.01 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.03)Dana Type

(54.03.01)Vicanite Group

54.03.01.01 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

54.03.01.02 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

54.03.01.03 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Help on Strunz Class: Strunz Class:

09.AJ.35 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AJ -Nesosilicates with BO3 triangles and/or B[4], Be[4] tetrahedra,

09.AJ.35 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m

09.AJ.35 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m

09.AJ.35 Hundholmenite-(Y)! (Y,REE,Ca,Na)15(Al,Fe)CaxAs1-x(Si,As)Si6B3(O,F)48 R 3m 3m

09.AJ.35 Proshchenkoite-(Y)! (Y,REE,Ca,Na,Mn)15FeCa(P,Si)Si6B3(O,F)48 R 3m 3m

Other Vicanite-(Ce) Information

Help on References: References:

NAME( MinRec) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(MinRec)

Help on See Also: See Also:

Links to other databases for Vicanite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Print or Cut-and-Paste your Vicanite-(Ce) Specimen Label here :

Vicanite-(Ce)

(Ca,Ce,La,Th)15As+++++(As+++0.5,Na0.5)Fe+++Si6B4O40F7
Dana No: 54.03.01.01 Strunz No: 09.AJ.35
Locality:

Notes: