Stibiomicrolite Mineral Data

Stibiomicrolite Mineral Data +

General Stibiomicrolite Information

Chemical Formula:

(Sb,Ca,Na)2(Ta,Nb)2(O,OH)7

Composition:

Molecular Weight = 538.04 gm

Sodium 2.14 % Na 2.88 % Na₂O

Calcium 5.21 % Ca 7.30 % CaO

Tantalum 43.72 % Ta 53.38 % Ta₂O₅

Niobium 12.09 % Nb 17.29 % Nb₂O₅

Antimony 15.84 % Sb 18.96 % Sb₂O₃

Hydrogen 0.19 % H 1.67 % H₂O

Oxygen 20.82 % O

______ ______

100.00 % 101.49 % = TOTAL OXIDE

Empirical Formula:

Sb_0.7Ca_0.7Na_0.5Ta_1.3Nb_0.7O₆(OH)

Environment:

Replacing stibiotantalite, in the lithium-rich albite unit of a complex granite pegmatite.

IMA Status:

Valid Species (Pre-IMA) 1938

Locality:

Varutrask pegmatite, 15 km norhtwest of Skelleftea, Vasterbotten, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named for antimony (STIBIum) in the composition and membership in the microlite subgroup of the pyrochlore group.

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Stibiomicrolite Crystallography

Cell Dimensions:

a = 10.455, Z = 8; V = 1,142.81 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): 3.01(1), 3.14(0.9), 6.03(0.8),

Physical Properties of Stibiomicrolite

Color:

Greenish white, White.

Diaphaniety:

Translucent to Opaque

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Stibiomicrolite

Gladstone-Dale:

CI calc= 0.166 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.16,KC= 0.1919

Optical Data:

Isotropic, n=2.

Calculated Properties of Stibiomicrolite

Electron Density:

r_electron=5.48 gm/cc
note: r_{Stibiomicrolite}=6.25 gm/cc.

Fermion Index

Fermion Index = 0.00022
Boson Index = 0.99978

Photoelectric:

PE_{Stibiomicrolite}= 587.05 barns/electron
U=PE_{Stibiomicrolite} x r_electron=3,215.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stibiomicrolite is Not Radioactive

Stibiomicrolite Classification

Dana Class:

8.2.2.7 (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.18-30 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 Stibiomicrolite Information

References:

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

See Also:

Links to other databases for Stibiomicrolite :
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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Stibiomicrolite

(Sb,Ca,Na)2(Ta,Nb)2(O,OH)7
Dana No: 8.2.2.7 Strunz No: IV/C.18-30
Locality:

Notes: