Vicanite-(Ce) Mineral Data + Say VICANITE-(CE)


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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 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),
Click Here for Large Vicanite-(Ce) Structure Window 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)

Help on Cleavage: Cleavage: None
Help on Color: Color: Yellow green, Green.
Help on Density: Density: 4.73
Help on Diaphaniety: Diaphaniety: 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= 0.091 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.067 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1604,KPDmeas= 0.1563,KC= 0.1719
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:

relectron=4.20 gm/cc
note: rVicanite-(Ce) =4.61 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.00732
Boson Index = 0.99268
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 = 176,486.01 (Gamma Ray American Petroleum Institute Units)

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
Bequerols
(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 4,068,978 1.10E-04 176,486.01 58.02
100 gm / 3.46 cm 406,898 1.10E-05 17,648.60 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: 54.3.1.1 (54)Nesosilicate Borosilicates and Some Beryllosilicates
  (54.3)Dana Type
  (54.3.1)Dana Group
 
54.3.1.1 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m
Help on Strunz Class: Strunz Class: VIII/B.33-25 VIII - Silicates
  VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron
  VIII/B.33 - Melanocerite-(Ce) - Tritomite-(Ce) series
 
VIII/B.33-10 Melanocerite-(Ce) (Ce,Th,Ca)5(Si,B)3O12(OH,F)·n(H2O)(?) Unk (HEX-R) Trig
 
VIII/B.33-20 Okanoganite-(Y) (Na,Ca)3(Y,Ce)12Si6B2O27F14 R 3m 3m
 
VIII/B.33-25 Vicanite-(Ce) (Ca,Ce,La,Th)15As(As0.5,Na0.5)FeSi6B4O40F7 R 3m 3m
 
VIII/B.33-30 Tritomite-(Y) (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13(?) P 63/m 6/m
 
VIII/B.33-40 Tritomite-(Ce) (Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13 P 63/m 6/m
 

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 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Vicanite-(Ce)

(Ca,Ce,La,Th)15As+++++(As+++0.5,Na0.5)Fe+++Si6B4O40F7
Dana No: 54.3.1.1 Strunz No: VIII/B.33-25
Locality:

 

Notes:

 
 
   
 
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