Natrobistantite Mineral Data

Natrobistantite Mineral Data +

General Natrobistantite Information

Chemical Formula:

(Na,Cs)Bi(Ta,Nb,Sb)4O12

Composition:

Molecular Weight = 1,101.75 gm

Cesium 3.62 % Cs 3.84 % Cs₂O

Sodium 1.46 % Na 1.97 % Na₂O

Tantalum 45.99 % Ta 56.15 % Ta₂O₅

Niobium 8.43 % Nb 12.06 % Nb₂O₅

Bismuth 20.86 % Bi 23.26 % Bi₂O₃

Antimony 2.21 % Sb 2.65 % Sb₂O₃

Oxygen 17.43 % O

______ ______

100.00 % 99.93 % = TOTAL OXIDE

Empirical Formula:

Na_0.7Cs_0.3Bi_1.1Ta_2.8NbSb_0.2O₁₂

Environment:

Replacing bismutotantalite in museum samples from a granitic pegmatite.

IMA Status:

Approved IMA 1983

Locality:

Koktoky [Fuyan], Sinkiang-Uighur Autonomous Province, China. Link to MinDat.org Location Data.

Name Origin:

For sodium (NATRium), BISmuth, and TANTalum in the chemical formula which deviates from the IMA pyrochlore nomenclature.

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Natrobistantite Crystallography

Cell Dimensions:

a = 10.502, Z = 4; V = 1,158.29 Den(Calc)= 6.32

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): 3.03(1), 1.858(0.9), 2.628(0.8),

Physical Properties of Natrobistantite

Cleavage:

None

Color:

Blue green, Colorless, Green, Yellow green.

Density:

6.1 - 6.2, Average = 6.15

Diaphaniety:

Transparent

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Octahedral Crystals - Occurs as octahedral shaped crystals.

Luminescence:

Fluorescent, Short UV=strong red orange.

Luster:

Adamantine

Streak:

white

Optical Properties of Natrobistantite

Optical Data:

Isotropic.

NCalc= 2.05 - from Gladstone-Dale relationship (KC = 0.1664) where Ncalc=Dcalc*KC+1
NCalc= 2.02 - from Gladstone-Dale relationship (KC = 0.1664) where Ncalc=Dmeas*KC+1

Calculated Properties of Natrobistantite

Electron Density:

r_electron=5.36 gm/cc
note: r_{Natrobistantite}=6.32 gm/cc.

Fermion Index

Fermion Index = 0.00013
Boson Index = 0.99987

Photoelectric:

PE_{Natrobistantite}= 992.51 barns/electron
U=PE_{Natrobistantite} x r_electron=5,318.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Natrobistantite is Not Radioactive

Natrobistantite Classification

Dana Class:

8.2.4.2 (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.18-60 IV - Oxides

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

IV/C.18 - Pyrochlore group, Microlite series with Ta > Nb

IV/C.18-10 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

IV/C.18-20 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-30 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-40 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

IV/C.18-50 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

IV/C.18-60 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m

IV/C.18-70 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

IV/C.18-80 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

Other Natrobistantite Information

References:

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

See Also:

Links to other databases for Natrobistantite :
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 -École des Mines de Paris

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Natrobistantite

(Na,Cs)Bi(Ta,Nb,Sb)4O12
Dana No: 8.2.4.2 Strunz No: IV/C.18-60
Locality:

Notes: