Mineralogy Database

Microlite Mineral Data

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General Microlite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)2Ta2O6(O,OH,F)
Help on Composition: Composition: Molecular Weight = 529.02 gm
   Sodium     6.52 %  Na    8.79 % Na2O
   Calcium    3.79 %  Ca    5.30 % CaO
   Tantalum  68.41 %  Ta   83.53 % Ta2O5
   Hydrogen   0.06 %  H     0.51 % H2O
   Oxygen    20.87 %  O
   Fluorine   0.36 %  F     0.36 % F
               -   %   F    -0.15 % -O=F2    
            ______        ______ 
            100.00 %       98.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na1.5Ca0.5Ta2O6.6(OH)0.3F0.1
Help on Environment: Environment: Granitic rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1835
Help on Locality: Locality: Isalnd of Uto, State of Stockholm, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek mikros - "small" and lithos - "stone."
Help on Name Pronunciation: Name Pronunciation: Microlite + Pronunciation Say MICROLITE
Help on Synonym: Synonym: Scandium microlite - Sc-bearing microlite
 

Microlite Image

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  Microlite

Comments: Brown crystal of microlite 10 mm in an albite matrix.
Location: Morefield Mine, Winterham, Amelia Co., Virginia, USA. Scale: 5x4x3 cm.
© John Betts - Fine Minerals

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  Microlite

Comments: Golden-colored microlite octahedrons on white albite.
Location: Maxixe Mine, Itinga, Minas Gerais, Brazil. Scale: Crystal size .5 cm.
© John Veevaert

Microlite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 10.41, Z = 8; V = 1,128.11 Den(Calc)= 6.23
Help on Crystal System: Crystal System: Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.98(1), 1.563(0.8), 1.836(0.8),
Help on Forms: Forms:

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Forms: ( 1 1 1) ( 0 1 1)

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Physical Properties of Microlite

Help on Cleavage: Cleavage: {111} Indistinct, {111} Indistinct, {111} Indistinct
Help on Color: Color: Yellowish brown, Reddish brown, Greenish brown, Green, Gray.
Help on Density: Density: 4.2 - 6.4, Average = 5.3
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Disseminated - Occurs in small, distinct particles dispersed in matrix.
Help on Habit: Habit: Pseudo Octohedral - Crystals show an octohedral outline.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Resinous
Help on Magnetism: Magnetism: Nonmagnetic
Help on Streak: Streak: light yellow
 

Optical Properties of Microlite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.332 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.133 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1766,KPDmeas= 0.2075,KC= 0.1559
Ncalc = 1.65 - 2
Help on Optical Data: Optical Data: Isotropic, n=2-2.2.
 

Calculated Properties of Microlite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.39 gm/cc
note: Specific Gravity of Microlite =6.23 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0002334809
Boson Index = 0.9997665191
Help on Photoelectric: Photoelectric: PEMicrolite = 814.71 barns/electron
U=PEMicrolite x rElectron Density=4,392.35 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Microlite is Not Radioactive
 

Microlite Classification

Help on  Dana Class: Dana Class: 08.02.02.01 (08)Multiple Oxides with Nb, Ta, and Ti
  (08.02)where (A)2 (B2O6) (O,OH,F)
  (08.02.02)Pyrochlore Group (Microlite Subgroup; Ta>Nb;(Ta+Nb)>2(Ti)
 
08.02.02.01 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
08.02.02.02 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.03 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.04 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.05 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
08.02.02.06 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.07 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
08.02.02.08 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
Help on  Strunz Class: Strunz Class: 04.DH.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DH -With large (� medium-sized) cations; sheets of edge-sharing octahedra
 
04.DH.15 Alumotungstite (W,Al)(O,OH)3(?) Unk Cubic
 
04.DH.15 Betafite (Ca,U)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ferritungstite (K,Ca,Na)(W,Fe)2(O,OH)6•(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Cesstibtantite (Cs,Na)SbTa4O12 F d3m 4/m 3 2/m
 
04.DH.15 Bismutomicrolite (Bi,Ca)(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Ceriopyrochlore-(Ce) (Ce,Ca,Y)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bariopyrochlore (Ba,Sr)(Nb,Ti)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Bariomicrolite Ba(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Calciobetafite Ca2(Ti,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Jixianite Pb(W,Fe)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Plumbomicrolite (Pb,Ca,U)2Ta2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Kalipyrochlore (H2O,Sr)(Nb,Ti)(O,OH)6•(H2O,K) F d3m 4/m 3 2/m
 
04.DH.15 Plumbopyrochlore (Pb,Y,U,Ca)2-xNb2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Strontiopyrochlore* Sr2Nb2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranmicrolite (U,Ca)2(Ta,Nb)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Pyrochlore (Na,Ca)2Nb2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Microlite (Na,Ca)2Ta2O6(O,OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Natrobistantite (Na,Cs)Bi(Ta,Nb,Sb)4O12 F d3m 4/m 3 2/m
 
04.DH.15 Plumbobetafite (Pb,U,Ca)(Ti,Nb)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Stibiomicrolite (Sb,Ca,Na)2(Ta,Nb)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stannomicrolite (Sn,Fe,Mn)(Ta,Nb,Sn)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Stibiobetafite (Sb,Ca)2(Ti,Nb,Ta)2(O,OH)7 F d3m 4/m 3 2/m
 
04.DH.15 Uranpyrochlore (U,Ca,Ce)2(Nb,Ta)2O6(OH,F) F d3m 4/m 3 2/m
 
04.DH.15 Bismutopyrochlore! (Bi,U,Ca,Pb)1x(Nb,Ta)2O6(OH)•n(H2O) F d3m 4/m 3 2/m
 
04.DH.15 Fluornatromicrolite! (Na,Ca,Bi)2Ta2O6F F d3m 4/m 3 2/m
 
04.DH.15 Yttrobetafite-(Y) (Y,U,Ce)2(Ti,Nb,Ta)2O6(OH) F d3m 4/m 3 2/m
 
04.DH.15 Yttropyrochlore-(Y) (Y,Na,Ca,U)1-2(Nb,Ta,Ti)2(O,OH)7 F d3m 2/m 3
 
04.DH.15 Elsmoreite! WO3•0.5(H2O) F d3m 4/m 3 2/m
 

Other Microlite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Microlite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - Scandinavian mineral gallery
17 - WWW-MINCRYST

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Print or Cut-and-Paste your Microlite Specimen Label here :

Microlite

(Na,Ca)2Ta2O6(O,OH,F)
Dana No: 08.02.02.01 Strunz No: 04.DH.15
Locality:

 

Notes:

 

 
   
 


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