Cappelenite-(Y) Mineral Data

General Cappelenite-(Y) Information

Chemical Formula:

Ba(Y,Ce)6Si3B6O24F2

Composition:

Molecular Weight = 1,344.28 gm

Barium 10.22 % Ba 11.41 % BaO

Cerium 20.85 % Ce 24.42 % Ce₂O₃

Yttrium 26.45 % Y 33.60 % Y₂O₃

Silicon 6.27 % Si 13.41 % SiO₂

Boron 4.82 % B 15.54 % B₂O₃

Oxygen 28.56 % O

Fluorine 2.83 % F 2.83 % F

- % F -1.19 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaY₄Ce₂Si₃B₆O₂₄F₂

Environment:

In small vein in nepheline synite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1885

Locality:

Lille-Aro in the Langesundfiord, southern Norway. Link to MinDat.org Location Data.

Name Origin:

For D. Cappelen of Holden, Norway, a collector who discovered the mineral, and its "yttrium" content.

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Cappelenite-(Y) Crystallography

Axial Ratios:

a:c = 1:0.43861

Cell Dimensions:

a = 10.67, c = 4.68, Z = 1; V = 461.43 Den(Calc)= 4.84

Crystal System:

Trigonal - PyramidalH-M Symbol (3) Space Group: P 3

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

By Intensity(I/I_o): 2.78(1), 1.94(0.5), 3.46(0.5),

Crystal Structure:

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Shen J , Moore P B , American Mineralogist , 69 (1984) p.190-195, Crystal structure of cappelenite, Ba(Y,RE)6[Si3B6O24]F2: a silicoborate, sheet structure

Physical Properties of Cappelenite-(Y)

Cleavage:

None

Color:

Greenish brown.

Density:

4.4

Diaphaneity:

Subtransparent to opaque

Fracture:

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

Habit:

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

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Optical Properties of Cappelenite-(Y)

Gladstone-Dale:

CI meas= -0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.074 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.157,KPDmeas= 0.1727,KC= 0.1695
Ncalc = 1.75 - 1.82

Optical Data:

Uniaxial (?), b=1.76.

Calculated Properties of Cappelenite-(Y)

Electron Density:

Bulk Density (Electron Density)=3.99 gm/cc
note: Specific Gravity of Cappelenite-(Y) =4.40 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_{Cappelenite-(Y)}= 185.69 barns/electron
U=PE_{Cappelenite-(Y)} x r_electron= 741.52 barns/cc.

Radioactivity:

GRapi = 20,180.14 (Gamma Ray American Petroleum Institute Units)
Concentration of Cappelenite-(Y) per GRapi unit = 49.55 (PPM)

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

**Estimated Radioactivity from Cappelenite-(Y)** - weak
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 / 7.57 cm	466,953	1.26E-05	20,180.14	6.63
100 gm / 3.51 cm	46,695	1.26E-06	2,018.01	0.66
10 gm / 1.63 cm	4,670	1.26E-07	201.80	0.07
1 gm / 7.57 mm	467	1.26E-08	20.18	0.01
0.1 gm / 3.51 mm	47	1.26E-09	2.02	0.00
0.01 gm / 1.63 mm	5	1.26E-10	0.20	0.00
0.001 gm / 0.76 mm	0	1.26E-11	0.02	0.00

Weight of pure Cappelenite-(Y) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.40 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 ( 1.04 % Th) From Sum REE Elements (20.85 % REE)

Cappelenite-(Y) Classification

Dana Class:

54.02.03.01 (54)Nesosilicate Borosilicates and Some Beryllosilicates

(54.02)with B in [4] coordination

(54.02.03)Cappellanite - Stillwellite group

54.02.03.01 Cappelenite-(Y) Ba(Y,Ce)6Si3B6O24F2 P 3 3

54.02.03.02 Stillwellite-(Ce) (Ce,La,Ca)BSiO5 P 3₁ 3

Strunz Class:

09.AJ.30 09 - SILICATES (Germanates)

09.A - Nesosilicates

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

09.AJ.30 Cappelenite-(Y) Ba(Y,Ce)6Si3B6O24F2 P 3 3

Other Cappelenite-(Y) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Cappelenite-(Y) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - WWW-MINCRYST

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Cappelenite-(Y)

Ba(Y,Ce)6Si3B6O24F2
Dana No: 54.02.03.01 Strunz No: 09.AJ.30
Locality:

Notes: