Vicanite-(Ce) Mineral Data

General Vicanite-(Ce) Information

Chemical Formula:

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

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

Empirical Formula:

Ca₈Ce_3.5La_2.5ThAsAs_0.5Na_0.5Fe³⁺Si₆B₄O₄₀F₇

Environment:

Inside a volcanic ejectum from a pyroclastic formation.

IMA Status:

Approved IMA 1995

Locality:

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

Name Origin:

After its locality.

Name Pronunciation:

Vicanite-(Ce)

Synonym:

IMA1991-050

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Vicanite-(Ce) Crystallography

Axial Ratios:

a:c = 1:2.53228

Cell Dimensions:

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

Crystal System:

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

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

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

Crystal Structure:

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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)

Cleavage:

None

Color:

Yellow green, Green.

Density:

4.73

Diaphaneity:

Transparent

Fracture:

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

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

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

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Vicanite-(Ce)

Dichroism (e):

colorless.

Dichroism (w):

colorless.

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

Optical Data:

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

Calculated Properties of Vicanite-(Ce)

Electron Density:

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

Fermion Index:

Fermion Index = 0.0073239745
Boson Index = 0.9926760255

Photoelectric:

PE_{Vicanite-(Ce)}= 377.04 barns/electron
U=PE_{Vicanite-(Ce)} x r_electron=1,583.18 barns/cc.

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
Specimen Size Weight/Volume (Sphere) *	Calculated Activity Becquerels (Bq)	Calculated Activity Curies (Ci)	Estimated Activity GR(api)	Estimated Exposure (mRem**)/hr If Held in Hand For 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

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

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

References:

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

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: