Cesstibtantite Mineral Data

Cesstibtantite Mineral Data

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General Cesstibtantite Information

Chemical Formula:

(Cs,Na)SbTa4O12

Composition:

Molecular Weight = 579.81 gm

Cesium 6.88 % Cs 7.29 % Cs₂O

Sodium 1.19 % Na 1.60 % Na₂O

Tantalum 59.30 % Ta 72.40 % Ta₂O₅

Niobium 1.60 % Nb 2.29 % Nb₂O₅

Antimony 12.60 % Sb 15.08 % Sb₂O₃

Hydrogen 0.12 % H 1.09 % H₂O

Oxygen 17.66 % O

Fluorine 0.66 % F 0.66 % F

- % F -0.28 % -O=F₂

______ ______

100.00 % 100.14 % = TOTAL OXIDE

Empirical Formula:

Cs_0.3(OH)_0.7Sb_0.6Na_0.3Ta_1.9Nb_0.1O_5.7F_0.2

Environment:

Highly fractionated granite pegmatites.

IMA Status:

Approved IMA 1982

Locality:

Leshaia pegmatite, Vuoriyarvi carbonatite complex, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for CESium, antimony (STIBium), and TANTalum in the composition.

Synonym:

ICSD 74283

PDF 35-672

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Cesstibtantite Crystallography

Cell Dimensions:

a = 10.256, Z = 7; V = 1,078.78 Den(Calc)= 6.25

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): 1.587(1), 1.84(1), 3.04(1),

Crystal Structure:

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Ercit T S , Cerny P , Hawthorne F C , Mineralogy and Petrology , 48 (1993) p.235-255, Cesstibtantite - a geologic introduction to the inverse pyrochlores, Locality: Leshaia pegmatite, Kola Peninsula, Russia, Sample: KO-1

View Additional jPOWD Structure files for Cesstibtantite
[1]

Physical Properties of Cesstibtantite

Cleavage:

None

Color:

Colorless, Gray, Yellow orange, Black.

Density:

6.4 - 6.6, Average = 6.5

Diaphaniety:

Transparent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

6.5 - Pyrite

Luminescence:

Fluorescent and cathodoluminescent, Long UV=yellow orange.

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Cesstibtantite

Gladstone-Dale:

CI meas= 0.239 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.209 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.128,KPDmeas= 0.1231,KC= 0.1618

Optical Data:

Isotropic, n=1.8.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Cesstibtantite in Air**
λ	R	∑ R(λ)
480 nm	13.80
551 nm	13.60
589 nm	13.60
656 nm	13.00

**Calculated Relative Intensity Colors of Cesstibtantite in Air**
Relative Intensity	0%	70%	100%	140%	210%	280%	350%	420%	490%	560%	630%	660%
R

Calculated Properties of Cesstibtantite

Electron Density:

r_electron=5.32 gm/cc
note: r_{Cesstibtantite}=6.25 gm/cc.

Fermion Index

Fermion Index = 0.00015
Boson Index = 0.99985

Photoelectric:

PE_{Cesstibtantite}= 793.94 barns/electron
U=PE_{Cesstibtantite} x r_electron=4,226.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Cesstibtantite is Not Radioactive

Cesstibtantite Classification

Dana Class:

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

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

(8.2.4)Pyrochlore Group (Cesstibtantite Subgroup; (Na,Cs)(Bi,Sb)(Ta,Nb)4O12

8.2.4.1 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m

8.2.4.2 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

Strunz Class:

IV/C.19-10 IV - Oxides

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

IV/C.19 - Pyrochlore group and related compounds

IV/C.19-10 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m

Other Cesstibtantite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(AntBidBlaNic3) OPTIC PROP.(AntBidBlaNic3)

See Also:

Links to other databases for Cesstibtantite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Cesstibtantite

(Cs,Na)SbTa4O12
Dana No: 8.2.4.1 Strunz No: IV/C.19-10
Locality:

Notes: