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Microlite Group

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Colour:
Pale yellow to reddish brown, sometimes emerald-green
Lustre:
Vitreous, Resinous
Hardness:
5 - 5½
Specific Gravity:
5.9 - 6.4
Crystal System:
Isometric
Name:
The microlite group has its name after the generic name microlite which was first introduced in 1835 by C.U. Shepard. From the Greek μικρός, small, in allusion to the usually small size of the crystals from the first recorded locality.
Ta-dominant members of the Pyrochlore Supergroup.

The nomenclature was recently revised by Atencio et al. (2010); see also Christy & Atencio (2013).

Visit gemdat.org for gemological information about Microlite Group.


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Classification of Microlite GroupHide

Approved
Notes:
Group Name, Renamed by the IMA
Approval History:
Renamed by IMA: 2010
4.00.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
0 :
0 :
8.2.2.1

8 : MULTIPLE OXIDES CONTAINING NIOBIUM,TANTALUM OR TITANIUM
2 : A2B2O6(O,OH,F)
18.1.11

18 : Niobates and Tantalates
1 : Niobates and tantalates containing neither rare earths nor U

Physical Properties of Microlite GroupHide

Vitreous, Resinous
Transparency:
Transparent
Colour:
Pale yellow to reddish brown, sometimes emerald-green
Streak:
Light yellow, brownish
Hardness:
5 - 5½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
Octahedral{111} (may be a parting), sometimes distinct, but usually not distinguishable.
Fracture:
Irregular/Uneven, Splintery, Sub-Conchoidal
Density:
5.9 - 6.4 g/cm3 (Measured)    6.33 g/cm3 (Calculated)
Comment:
Calc for Ca:Na = 1:1

Optical Data of Microlite GroupHide

Type:
Isotropic
Type:
Isotropic

Crystallography of Microlite GroupHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Morphology:
Octahedral, often with subordinate {001}, {113} or {001}.
Twinning:
Twin plane {111} (spinel law twins), rare.

Crystallographic forms of Microlite GroupHide

Crystal Atlas:
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Microlite no.1 - Goldschmidt (1913-1926)
Microlite no.4 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of Microlite GroupHide

Synonyms of Microlite GroupHide

Other Language Names for Microlite GroupHide

Simplified Chinese:细晶石族
细晶石
Spanish:Microlita

Varieties of Microlite GroupHide

Bariomicrolite (of Hogarth 1977)A discredited mineral. According to the new IMA nomenclature of the Pyrochlore Supergroup the mineral formerly named as bariomicrolite is probably a hydrokenomicrolite. (Atencio et al. 2010).
The type sample apparently has □ dominant at the A position...
NatrobistantiteNatrobistantite studied by Voloshin et al. (1983) and by Beurlen et al. (2005) are both a zero valent dominant member of the microlite group with significant contents (in wt.%) of bismuth and cesium.
Scandium Microlite (of Bergstøl & Juve)A Sc-bearing microlite group mineral. An incompletely described mineral. "Sc exceeds 20 % of the total A atoms and is the most abundant A atom other than Ca" (Bergstøl & Juve 1988). Found in an altered area of an ixiolite.
Stannomicrolite (of Hogarth 1977)The stannomicrolite species of Ercit et al. (1987) [“sukulaite” of Vorma & Siivola (1967)] is oxystannomicrolite. The stannomicrolite of Uher et al. (2008) is a calciomicrolite or a zero valent dominant member of the microlite group.
Uranmicrolite (of Hogarth 1977)The uranmicrolite species of Hogarth (1977), “djalmaite” of Guimarães 1939, are not rich enough in U to warrant a status as a separate species (Atencio et al. 2010). Included are the samples described as uranmicrolite by Baldwin 1989, Rub et al. 199...
Zero valent dominant member of the Microlite GroupWhere either vacancy or H2O are dominant, but it cannot be proven which one.

Relationship of Microlite Group to other SpeciesHide

Other Members of this group:
Betafite GroupA2(Ti,Nb)2O6Z
Coulsellite GroupGroup, where M2+ cations are dominant at the B site, and Mg is dominant among them, and F1– is ...
Elsmoreite GroupW-dominant members of the Pyrochlore Supergroup.
Pyrochlore GroupA2Nb2(O,OH)6Z
Ralstonite GroupGroup, where M3+ cations are dominant at the B site, and Al is dominant among them, and F1– is ...
Roméite GroupSb-dominant members of the Pyrochlore Supergroup.
Group Members:
Fluorcalciomicrolite (Ca,Na)2(Ta,Nb)2O6FIso. m3m (4/m 3 2/m) : Fd3m
Fluornatromicrolite (Na1.5Bi0.5)Ta2O6FIso. m3m (4/m 3 2/m) : Fd3m
Hydrokenomicrolite (◻,H2O)2Ta2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m)
Hydromicrolite (H2O,◻)2Ta2(O,OH)6(H2O)
Hydroxycalciomicrolite Ca1.5Ta2O6(OH)Iso. 4 3 2 : P42 3 2
Hydroxykenomicrolite (◻,Na,Sb3+)2Ta2O6(OH)Iso.
Kenoplumbomicrolite (Pb,◻)2Ta2O6(◻,OH,O)Iso.
Oxycalciomicrolite Ca2Ta2O6O
Oxystannomicrolite Sn2Ta2O6O
Oxystibiomicrolite (Sb3+,Ca)2Ta2O6O
Yttromicrolite (of Hogarth) (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7Iso. m3m (4/m 3 2/m) : Fd3m

Related Minerals - Nickel-Strunz GroupingHide

4.00.Goethiteα-Fe3+O(OH)Orth. mmm (2/m 2/m 2/m)
4.00.Ferrotaaffeite-6N'3S(Be,Zn,Mg)FeAl4O8Trig.
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group
4.00.Ferrohögbomite-2N2S[(Fe2+,Mg,Zn,Al)3(Al,Ti,Fe3+)8O15(OH)]2Hex. 6mm : P63mc
4.00.Písekite-(Y)(Y,As,Ca,Fe,U)(Nb,Ti,Ta)O4
4.00.UM2004-19-O:AlCeGdZr(Gd,Ce)4Al2Zr4O17
4.00.UM2004-21-O:CaFeGdZrCa2Gd4Fe5ZrO15
4.00.UM2004-27-O:GdTiGd2Ti4O11
4.00.Mapiquiroite(Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38Trig. 3 : R3
4.00.AlmeidaitePbZn2(Mn,Y)(Ti,Fe3+)18O37(OH,O)Trig. 3 : R3
4.00.VapnikiteCa2CaUO6Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

18.1.1LithiotantiteLiTa3O8Mon.
18.1.2LueshiteNaNbO3Orth. mmm (2/m 2/m 2/m)
18.1.3NatroniobiteNaNbO3Mon.
18.1.4FranconiteNa(Nb2O5)(OH) · 3H2OMon.
18.1.5NatrotantiteNa2Ta4O11Mon.
18.1.6IrtyshiteNa2(Ta,Nb)4O11Hex.
18.1.7Rankamaite(Na,K)3(Ta,Nb,Al)11(O,OH)31Orth. mmm (2/m 2/m 2/m) : Cmmm
18.1.8Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.9CalciotantiteCaTa4O11Hex.
18.1.10RynersoniteCaTa2O6Orth. mmm (2/m 2/m 2/m)
18.1.12BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)Amor.
18.1.13LatrappiteCa2NbFe3+O6Orth. mmm (2/m 2/m 2/m) : Pnma
18.1.14Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2OMon.
18.1.15Bariomicrolite (of Hogarth 1977)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2OTrig.
18.1.17Bariopyrochlore (of Hogarth 1977)A2Nb2(O,OH)6ZIso. m3m (4/m 3 2/m) : Fd3m
18.1.18AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.19SimpsoniteAl4(Ta,Nb)3O13(OH,F)Trig. 3 : P3
18.1.20Sosedkoite(K,Na)5Al2(Ta,Nb)22O60Orth.
18.1.21Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6Mon.
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.23FoorditeSn2+(Nb,Ta)2O6Mon. 2/m : B2/b
18.1.24ChangbaiitePbNb2O6Trig.
18.1.25Plumbopyrochlore (of Skorobogatova et al.)A2Nb2(O,OH)6Z
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSb(Nb,Ta)O4Orth. mm2
18.1.28StibiotantaliteSb(Ta,Nb)O4Orth. mm2
18.1.29NatrobistantiteIso.
18.1.30Cesplumtantite(Cs,Na)2(Pb,Sb3+)3Ta8O24Tet.
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBi(Ta,Nb)O4Orth.
18.1.35Bismutomicrolite (of Hogarth 1977)Iso. m3m (4/m 3 2/m) : Fd3m
18.1.36Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.37Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
18.1.38Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
18.1.39Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.40WodginiteMn2+Sn4+Ta2O8Mon.
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
18.1.42Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.43Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
18.1.44ColumbiteOrth. mmm (2/m 2/m 2/m) : Pbcn
18.1.45Tantalite(Mn,Fe)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m)
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
18.1.48Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other InformationHide

Health Risks:
May be radioactive

References for Microlite GroupHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Shepard, C.U. (1835) Microlite, a new mineral species. American Journal of Science: 27: 361.
Shepard (1837) American Journal of Science: 32: 338.
Hayes (1842) American Journal of Science: 43: 33.
Shepard (1842) American Journal of Science: 43: 116.
Hayes (1844) American Journal of Science: 46: 158.
Shepard (1870) American Journal of Science: 50: 93 (as Haddamite).
Nordenskiöld (1872) Geol. För. Förh.: 3: 282.
Nordenskiöld (1894) Geol. För. Förh.: 16: 336.
Machatschki (1932) Chem. Erde: 7: 56.
Palache, C., Berman, H., and Frondel, C. (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 748-756.
American Mineralogist (1977) 62: 403-410.
Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (1997) Handbook of Mineralogy, Volume III. Halides, Hydroxides, Oxides. Mineral Data Publishing, Tucson, AZ, 628pp.: 372.
Atencio, D., Andrade, M.B., Christy, A.G., Giere, R., and Kartashov P.M. (2010) The pyrochlore supergroup of minerals: nomenclature. Canadian Mineralogist: 48: 673-698.
Christy, A.G. and Atencio, D. (2013) Clarification of status of species in the pyrochlore supergroup. Mineralogical Magazine: 77: 13-20.

Internet Links for Microlite GroupHide

Localities for Microlite GroupHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

Mineral and/or Locality  
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