Bariomicrolite Mineral Data

Bariomicrolite Mineral Data +

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General Bariomicrolite Information

Chemical Formula:

Ba(Ta,Nb)2(O,OH)7

Composition:

Molecular Weight = 506.31 gm

Barium 8.14 % Ba 9.08 % BaO

Tantalum 64.33 % Ta 78.55 % Ta₂O₅

Niobium 3.67 % Nb 5.25 % Nb₂O₅

Hydrogen 0.80 % H 7.12 % H₂O

Oxygen 23.07 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ba_0.3Ta_1.8Nb_0.2O_5.3(H₂O)₂

Environment:

In a concentrate from alluvium derived from a pegmatite.

IMA Status:

Approved IMA 1977

Locality:

Chi-Chico, Sao Joao del Rei, Minas Gerais, Brazil. Link to MinDat.org Location Data.

Name Origin:

Assigned by the IMA pyrochlore nomenclature group for the predominant barium content and to microlite.

Synonym:

ICSD 45824 ?

PDF 16-616

Rijkeboerite

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Bariomicrolite Crystallography

Cell Dimensions:

a = 10.57, Z = 8; V = 1,180.93 Den(Calc)= 5.70

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), 6.04(0.8), 3.18(0.65),

Physical Properties of Bariomicrolite

Color:

Brown, Colorless, Yellow, White, Pink brown.

Density:

5.68

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

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

Hardness:

4.5-5 - Near Apatite

Luster:

Adamantine - Resinous

Streak:

white

Optical Properties of Bariomicrolite

Optical Data:

NCalc= 1.96 - from Gladstone-Dale relationship (KC = 0.1685) where Ncalc=Dcalc*KC+1
NCalc= 1.96 - from Gladstone-Dale relationship (KC = 0.1685) where Ncalc=Dmeas*KC+1

Calculated Properties of Bariomicrolite

Electron Density:

r_electron=4.93 gm/cc
note: r_{Bariomicrolite}=5.70 gm/cc.

Fermion Index

Fermion Index = 0.01469
Boson Index = 0.98531

Photoelectric:

PE_{Bariomicrolite}= 810.23 barns/electron
U=PE_{Bariomicrolite} x r_electron=3,991.56 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bariomicrolite is Not Radioactive

Bariomicrolite Classification

Dana Class:

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

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

(8.2.2)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)

8.2.2.1 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m

8.2.2.2 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.3 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m

8.2.2.4 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

8.2.2.5 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m

8.2.2.6 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.7 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m

8.2.2.8 IMA1998-018! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m

Strunz Class:

IV/C.18-40 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 Bariomicrolite Information

References:

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

See Also:

Links to other databases for Bariomicrolite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Bariomicrolite

Ba(Ta,Nb)2(O,OH)7
Dana No: 8.2.2.2 Strunz No: IV/C.18-40
Locality:

Notes: