Calciobetafite Mineral Data

Calciobetafite Mineral Data +

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General Calciobetafite Information

Chemical Formula:

Ca2(Ti,Nb)2(O,OH)7

Composition:

Molecular Weight = 394.30 gm

Calcium 15.25 % Ca 21.33 % CaO

La,Ce,Pr,Nd,Sm, 7.30 % RE 8.52 % REE₂O₃

Thorium 5.88 % Th 6.70 % ThO₂

Uranium 6.04 % U 6.85 % UO₂

Titanium 9.71 % Ti 16.21 % TiO₂

Niobium 28.27 % Nb 40.45 % Nb₂O₅

Iron 1.42 % Fe 1.82 % FeO

Hydrogen 0.08 % H 0.69 % H₂O

Oxygen 25.56 % O

Fluorine 0.48 % F 0.48 % F

- % F -0.20 % -O=F₂

______ ______

100.00 % 102.84 % = TOTAL OXIDE

Empirical Formula:

Ca_1.5REE_0.2Th_0.1U_0.1Nb_1.2Ti_0.8Fe²⁺_0.1O₆(OH)_0.3F_0.1

Environment:

In a subvolcanic rock, locally termed "sanidinite", present in a phreatomagmatic explosion breccia.

IMA Status:

Approved IMA 1983

Locality:

From Monte di Procida, Campi Flegrei, near Naples, Campania, Italy. Link to MinDat.org Location Data.

Name Origin:

For the mineral with the betafite structure and the CALCIum content.

Synonym:

ICSD 31196

PDF 42-2

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Calciobetafite Crystallography

Cell Dimensions:

a = 10.2978, Z = 8; V = 1,092.03 Den(Calc)= 4.80

Crystal System:

Isometric - HexoctahedralH-M Symbol (4/m 3 2/m) Space Group: F d3m

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

By Intensity(I/I_o): 2.973(1), 1.82(0.53), 1.552(0.45),

Crystal Structure:

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Mazzi F , Munno R , American Mineralogist , 68 (1983) p.262-276, Calciobetafite (new mineral of the pyrochlore group) and related minerals from

Physical Properties of Calciobetafite

Color:

Reddish brown.

Density:

4.2 - 4.5, Average = 4.34

Diaphaniety:

Subtranslucent to Opaque

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Habit:

Metamict - Mineral originally crystalline, now amorphous due to radiation damage.

Hardness:

4.5-5.5 - Near Apatite

Luster:

Resinous

Optical Properties of Calciobetafite

Optical Data:

Isotropic.

NCalc= 2.21 - from Gladstone-Dale relationship (KC = 0.252) where Ncalc=Dcalc*KC+1
NCalc= 2.1 - from Gladstone-Dale relationship (KC = 0.252) where Ncalc=Dmeas*KC+1

Calculated Properties of Calciobetafite

Electron Density:

r_electron=4.42 gm/cc
note: r_{Calciobetafite}=4.80 gm/cc.

Fermion Index

Fermion Index = 0.02721
Boson Index = 0.97279

Photoelectric:

PE_{Calciobetafite}= 375.93 barns/electron
U=PE_{Calciobetafite} x r_electron=1,660.33 barns/cc.

Radioactivity:

GRapi = 588,995.54 (Gamma Ray American Petroleum Institute Units)

Calciobetafite 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) 51.64 ± 12.91 grams of pure Calciobetafite .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5164.2 ±1291.0 grams of pure Calciobetafite .

**Estimated Radioactivity from Calciobetafite** - 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 / 7.36 cm	13,442,791	3.63E-04	588,995.54	193.64
100 gm / 3.41 cm	1,344,279	3.63E-05	58,899.55	19.36
10 gm / 1.58 cm	134,428	3.63E-06	5,889.96	1.94
1 gm / 7.36 mm	13,443	3.63E-07	589.00	0.19
0.1 gm / 3.41 mm	1,344	3.63E-08	58.90	0.02
0.01 gm / 1.58 mm	134	3.63E-09	5.89	0.00
0.001 gm / 0.74 mm	13	3.63E-10	0.59	0.00

Weight of pure Calciobetafite in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.80 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

Calciobetafite Classification

Dana Class:

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

(8.2)where (A)2 (B2O6) (O,OH,F)

(8.2.3)Pyrochlore Group (Betafite Subgroup; 2(Ti)>(Ta+Nb)

8.2.3.1 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

8.2.3.2 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m

8.2.3.3 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m

8.2.3.4 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m

8.2.3.5 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

Strunz Class:

IV/C.17-20 IV - Oxides

IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)

IV/C.17 - Pyrochlore group, Pyrochlore series with Nb > Ti

IV/C.17-10 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-20 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-30 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6·(H2O,K) F d3m 4/m 3 2/m

IV/C.17-40 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-50 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.17-60 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3

IV/C.17-70 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

IV/C.17-80 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m

IV/C.17-85 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)·n(H2O) F d3m 4/m 3 2/m

IV/C.17-90 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m

Other Calciobetafite Information

References:

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

See Also:

Links to other databases for Calciobetafite :
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 - Uranium Minerals 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Calciobetafite

Ca2(Ti,Nb)2(O,OH)7
Dana No: 8.2.3.5 Strunz No: IV/C.17-20
Locality:

Notes: