Stannomicrolite Mineral Data

Stannomicrolite Mineral Data +

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General Stannomicrolite Information

Chemical Formula:

(Sn++,Fe++,Mn++)(Ta,Nb,Sn++++)2(O,OH)7

Composition:

Molecular Weight = 637.44 gm

Tantalum 34.06 % Ta 41.59 % Ta₂O₅

Titanium 0.75 % Ti 1.25 % TiO₂

Manganese 0.86 % Mn 1.11 % MnO

Niobium 5.83 % Nb 8.34 % Nb₂O₅

Iron 1.75 % Fe 2.25 % FeO

Tin 39.11 % Sn 35.93 % SnO / 9.46 % SnO₂

Hydrogen 0.06 % H 0.57 % H₂O

Oxygen 17.57 % O

______ ______

100.00 % 100.50 % = TOTAL OXIDE

Empirical Formula:

Sn_1.7Fe²⁺_0.2Mn²⁺_0.1Ta_1.2Sn_0.4Nb_0.4Ti_0.1O_6.6(OH)_0.4

Environment:

Replacing ferrowodginite inclusions in tantalian cassiterite, in a museum specimen from a granite pegmatite.

IMA Status:

Approved IMA 1977

Locality:

Sukula, Tammela, Finland. Link to MinDat.org Location Data.

Name Origin:

Named for tin (STANNum), in the formula and membership in the microlite subgroup of the pyrochlore group.

Synonym:

ICSD 38892

PDF 13-1441

Sukulaite

Stannomicrolite Image

Images:

Click Here for Larger Stannomicrolite Image

Stannomicrolite Stokesite

Comments: Stokesite "ball" composed of lath-like tan or clear crystals with several micro crystals of yellow stannomicrolite.
Location: Urucum mine, Galileia, Minas Gerais, Brazil. Scale: 1.2 cm.
© Tom Loomis / Dakota Matrix

Stannomicrolite Crystallography

Cell Dimensions:

a = 10.57, Z = 8; V = 1,180.93 Den(Calc)= 7.17

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): 3.05(1), 1.589(0.8), 1.866(0.8),

Crystal Structure:

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Gasperin M , Comptes Rendus Hebdomadaires des Seances de l Academie des Sciences , 240 (1955) p.2340-2342, Synthese et identification de deux oxydes doubles de tantale et d etain, Sample: synthetic

Physical Properties of Stannomicrolite

Color:

Yellow brown.

Density:

8.34

Diaphaniety:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Selvage - As a reaction rim, surrounding the host mineral.

Hardness:

4.5-5.5 - Near Apatite

Luster:

Adamantine

Optical Properties of Stannomicrolite

Optical Data:

Isotropic, n=2.08.

Calculated Properties of Stannomicrolite

Electron Density:

r_electron=6.19 gm/cc
note: r_{Stannomicrolite}=7.17 gm/cc.

Fermion Index

Fermion Index = 0.06646
Boson Index = 0.93354

Photoelectric:

PE_{Stannomicrolite}= 541.28 barns/electron
U=PE_{Stannomicrolite} x r_electron=3,352.27 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Stannomicrolite is Not Radioactive

Stannomicrolite Classification

Dana Class:

8.2.2.6 (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.18-20 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 Stannomicrolite Information

References:

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

See Also:

Links to other databases for Stannomicrolite :
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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Stannomicrolite

(Sn++,Fe++,Mn++)(Ta,Nb,Sn++++)2(O,OH)7
Dana No: 8.2.2.6 Strunz No: IV/C.18-20
Locality:

Notes: