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Microlite Group

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System:
Isometric
Colour:
Pale yellow to reddish ...
Lustre:
Vitreous, Resinous
Hardness:
5 - 5½
Name:
From the Greek μικρός, small, in allusion to the usual small size of the crystals from the type locality.
The nomenclature was recently revised by Atencio et al. (2010); see also Christy & Atencio (2013).

Visit gemdat.org for gemological information about Microlite Group.

Classification of Microlite Group

Redefined Approved 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
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Type Occurrence of Microlite Group

Year of Discovery:
1835

Occurrences of Microlite Group

Geological Setting:
Albitized parts of granite pegmatites.

Physical Properties of Microlite Group

Vitreous, Resinous
Diaphaneity (Transparency):
Transparent
Colour:
Pale yellow to reddish brown, sometimes emerald-green
Streak:
Light yellow, brownish
Hardness (Mohs):
5 - 5½
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

Crystallography of Microlite Group

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 Group

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

Optical Data of Microlite Group

Type:
Isotropic
Type:
Isotropic

Relationship of Microlite Group to other Species

Other Members of Group:
Group Members:
Fluorcalciomicrolite (Ca,Na)2(Ta,Nb)2O6F
Fluornatromicrolite (Na,Ca,Bi)2Ta2O6F
Hydrokenomicrolite (◻,H2O)2Ta2(O,OH)6(H2O)
Hydromicrolite (H2O,◻)2Ta2(O,OH)6(H2O)
Hydroxycalciomicrolite Ca1.5Ta2O6(OH)
Hydroxykenomicrolite (◻,Na,Sb3+)2Ta2O6(OH)
Kenoplumbomicrolite (Pb,◻)2Ta2O6(◻,O,OH)
Oxycalciomicrolite Ca2Ta2O6O
Oxystannomicrolite Sn2Ta2O6O
Oxystibiomicrolite (Sb3+,Ca)2Ta2O6O
Yttromicrolite (of Hogarth) (Ca,Y3+,U,Na)2-x(Ta,Nb,Ti,Fe3+)2O7
4.00.Goethiteα-Fe3+O(OH)
4.00.Pyrochlore GroupA2Nb2(O,OH)6Z
4.00.Roméite Group
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
18.1.1LithiotantiteLi(Ta,Nb)3O8
18.1.2LueshiteNaNbO3
18.1.3NatroniobiteNaNbO3
18.1.4FranconiteNa2Nb4O11 · 9H2O
18.1.5NatrotantiteNa2Ta4O11
18.1.6IrtyshiteNa2(Ta,Nb)4O11
18.1.7Rankamaite(Na,K)3(Ta,Nb,Al)11(O,OH)31
18.1.8Hydropyrochlore(H2O,□)2Nb2(O,OH)6(H2O)
18.1.9CalciotantiteCaTa4O11
18.1.10RynersoniteCa(Ta,Nb)2O6
18.1.12BelyankiniteCa1-2(Ti,Nb)5O12 · 9H2O (?)
18.1.13Latrappite(Ca,Na)(Nb,Ti,Fe)O3
18.1.14Hochelagaite(Ca,Na,Sr)(Nb,Ti,Si,Al)4O11 · 8H2O
18.1.15Bariomicrolite (of Hogarth 1977)
18.1.16ParabariomicroliteBaTa4O10(OH)2 · 2H2O
18.1.17Bariopyrochlore (of Hogarth 1977)
18.1.18AlumotantiteAlTaO4
18.1.19SimpsoniteAl4(Ta,Nb)3O13(OH,F)
18.1.20Sosedkoite(K,Na)5Al2(Ta,Nb)22O60
18.1.21Thoreaulite(Sn2+,Pb)(Ta,Nb)2O6
18.1.22Stannomicrolite (of Hogarth 1977)
18.1.23Foordite(Sn,Pb)(Nb,Ta)2O6
18.1.24ChangbaiitePbNb2O6
18.1.25Plumbopyrochlore (of Skorobogatova et al.)
18.1.26Plumbomicrolite (of Hogarth 1977)
18.1.27StibiocolumbiteSb(Nb,Ta)O4
18.1.28StibiotantaliteSb(Ta,Nb)O4
18.1.29Natrobistantite
18.1.30Cesplumtantite(Cs,Na)2(Pb,Sb3+)3Ta8O24
18.1.31Stibiomicrolite (of Groat et al.)
18.1.32Cesstibtantite
18.1.34BismutotantaliteBi(Ta,Nb)O4
18.1.35Bismutomicrolite (of Hogarth 1977)
18.1.36Tantalite-(Mn)MnTa2O6
18.1.37Gerasimovskite(Mn,Ca)(Nb,Ti)5O12 · 9H2O
18.1.38Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6
18.1.39Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6
18.1.40WodginiteMn(Sn,Ta)Ta2O8
18.1.41Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8
18.1.42Columbite-(Fe)FeNb2O6
18.1.43Tantalite-(Fe)FeTa2O6
18.1.44Columbite(Fe,Mn)(Nb,Ta)2O6
18.1.45Tantalite(Fe,Mn)(Ta,Nb)2O6
18.1.46Tapiolite(Fe,Mn)(Ta,Nb)2O6
18.1.47Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6
18.1.48Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6
18.1.50Strüverite(Ti,Ta,Fe)O2
18.1.51 Staringite(Fe,Mn)x(Ta,Nb)2xSn6-3xO12

Other Names for Microlite Group

Name in Other Languages:
Simplified Chinese:细晶石族
细晶石
Spanish:Microlita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Microlite Group

Reference List:
Shepard (1835), 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, Charles, Harry Berman & Clifford Frondel (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., 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 Group

Specimens:
The following Microlite Group specimens are currently listed for sale on minfind.com.

Localities for Microlite Group

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.
Mineral and/or Locality  
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