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Srilankite

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Formula:
ZrTi2O6
Colour:
Black, blackish brown
Lustre:
Sub-Adamantine, Resinous, Sub-Metallic
Hardness:
Specific Gravity:
4.6
Crystal System:
Orthorhombic
Name:
Named in 1983 by Alexander Willgallis, Eveline Siegmann, and Theja Hettiaratchi after its discovery locality at Rakwana, Sabaragamuwa Province, Sri Lanka.
Hide all sections | Show all sections

Classification of SrilankiteHide

Approved
Approval Year:
1982
4.DB.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
B : With medium-sized cations; chains of edge-sharing octahedra
4.4.13.2

4 : SIMPLE OXIDES
4 : AX2
7.10.4

7 : Oxides and Hydroxides
10 : Oxides of Zr and Th

Physical Properties of SrilankiteHide

Sub-Adamantine, Resinous, Sub-Metallic
Transparency:
Transparent, Translucent
Colour:
Black, blackish brown
Hardness:
6½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
not given
Fracture:
Sub-Conchoidal
Density:
4.6 g/cm3 (Measured)    4.77 g/cm3 (Calculated)

Optical Data of SrilankiteHide

Type:
Biaxial (-)
RI values:
n = 2.38
2V:
Measured: 16°
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Reflectivity:
18.4-16.0 (546)18.5-16.4 (589)18.7-17.0 (649)nmR=9.4-18.6 (480%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 9.4-18.6 (480%.
Internal Reflections:
Brown, dark blue

Chemical Properties of SrilankiteHide

Formula:
ZrTi2O6
IMA Formula:
Ti2ZrO6

Crystallography of SrilankiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Setting:
Pbcn
Cell Parameters:
a = 4.708 Å, b = 5.553 Å, c = 5.019 Å
Ratio:
a:b:c = 0.848 : 1 : 0.904
Unit Cell V:
131.21 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular crystal, often twinned
Twinning:
Interpenetration and contact twins

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.61 (25)
2.92 (100)
1.864 (15)
1.793 (15)
1.721 (30)
1.692 (25)
1.516 (35)

Type Occurrence of SrilankiteHide

Geological Setting of Type Material:
Alluvial deposit
Associated Minerals at Type Locality:

Synonyms of SrilankiteHide

Other Language Names for SrilankiteHide

Relationship of Srilankite to other SpeciesHide

Other Members of this group:
Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
IshikawaiteU4+Fe2+Nb2O8Mon.
Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Mon. 2/m : P2/b

Related Minerals - Nickel-Strunz GroupingHide

4.DB.05ArgutiteGeO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05CassiteriteSnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05PlattneritePbO2Tet. 4/mmm (4/m 2/m 2/m)
4.DB.05PyrolusiteMnO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05RutileTiO2Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.05TripuhyiteFe3+Sb5+O4Tet.
4.DB.05TugarinoviteMoO2Mon.
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb2O6Tet. 4/mmm (4/m 2/m 2/m) : P4/nmm
4.DB.10Tapiolite-(Fe)(Fe,Mn)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10Tapiolite-(Mn)(Mn,Fe)(Ta,Nb)2O6Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
4.DB.10OrdoñeziteZnSb2O6Tet.
4.DB.15bAkhtenskiteε-Mn4+O2Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
4.DB.15cNsutite(Mn4+,Mn2+)(O,OH)2Hex.
4.DB.15aParamontroseiteV4+O2Orth.
4.DB.15aRamsdelliteMn4+O2Orth. mmm (2/m 2/m 2/m)
4.DB.20Scrutinyiteα-PbO2Orth.
4.DB.25IshikawaiteU4+Fe2+Nb2O8Mon.
4.DB.25Ixiolite(Ta,Nb,Sn,Fe,Mn)4O8Orth.
4.DB.25Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.25Yttrocolumbite-(Y)Y(U4+,Fe2+)Nb2O8
4.DB.25Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8Mon.
4.DB.25Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8Mon. 2/m : P2/b
4.DB.30FerberiteFeWO4Mon. 2/m : P2/b
4.DB.30HübneriteMnWO4Mon. 2/m : P2/b
4.DB.30Sanmartinite(Zn,Fe)WO4Mon. 2/m : P21/b
4.DB.30KrasnoselskiteCoWO4Mon.
4.DB.30HeftetjerniteScTaO4Mon. 2/m
4.DB.30HuanzalaiteMgWO4Mon. 2/m : P2/b
4.DB.35Columbite-(Fe)FeNb2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Fe)FeTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mn)(Mn,Fe)(Nb,Ta)2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Tantalite-(Mn)MnTa2O6Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.35Columbite-(Mg)(Mg,Fe,Mn)(Nb,Ta)2O6Orth.
4.DB.35Qitianlingite(Fe,Mn)2(Nb,Ta)2WO10Orth.
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)(Mg,Fe2+)(Ta,Nb)2O6Orth. mmm (2/m 2/m 2/m)
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8Mon.
4.DB.40LithiotantiteLiTa3O8Mon.
4.DB.40LithiowodginiteLiTa3O8Mon.
4.DB.40TitanowodginiteMn2+TiTa2O8Mon.
4.DB.40WodginiteMn2+Sn4+Ta2O8Mon.
4.DB.40FerrotitanowodginiteFe2+TiTa2O8Mon.
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteV3+TiO3(OH)Mon.
4.DB.50Carmichaelite(Ti,Cr,Fe)[O2-x(OH)x]Mon. 2/m : P21/b
4.DB.55AlumotantiteAlTaO4Orth. mmm (2/m 2/m 2/m) : Pbcn
4.DB.60Biehlite((Sb,As)O)2[MoO4]Mon.

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

4.4.13.1Tazheranite(Zr,Ti,Ca)O2-xIso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

7.10.1BaddeleyiteZrO2Mon. 2/m : P21/b
7.10.2ArkeliteIso.
7.10.3PainiteCaZrAl9(BO3)O15Hex.
7.10.5ZirconoliteCaZrTi2O7Orth.
7.10.6CalzirtiteCaZr3TiO9Tet.
7.10.7Tazheranite(Zr,Ti,Ca)O2-xIso.
7.10.8Zirkelite(Ti,Ca,Zr)O2-xIso.
7.10.9UhligiteCa3(Ti,Al,Zr)9O20 ?Iso.
7.10.10ThorianiteThO2Iso. m3m (4/m 3 2/m)

Fluorescence of SrilankiteHide

Not fluorescent in UV

Other InformationHide

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 SrilankiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Alexander Willgallis, Eveline Siegmann, and Theja Hettiaratchi (1983) Neues Jahrbuch für Mineralogie, Monatshefte (1983): 151-157.
Zeitschrift für Kristallographie (1983): 164: 59-66.
American Mineralogist (1984): 69: 212.

Internet Links for SrilankiteHide

Localities for SrilankiteHide

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 ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Indian Ocean
 
  • Southwest Indian Ridge
Am Min 89:5-6 pp 759-766
Myanmar
 
  • Mandalay Region (Mandalay Division)
    • Pyin-Oo-Lwin District
      • Mogok Township
        • Kyauk-Pyat-That
          • Thurein-taung
Ted Themelis (2008) Gems & mines of Mogok
Russia
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
Mikhailova, Y.A., Konopleva, N.G., Yakovenchuk, V.N., Ivanyuk, G.Y., Men’shikov, Y.P., and Pakhomovsky, Y.A. (2007): Geology of Ore Deposits 49(7), 590-598.
  • Urals Region
    • Southern Urals
      • Chelyabinsk Oblast'
        • Kyshtym (Kychtym; Kishtim)
V. G. Korinevsky & I. A. Blinov (2016): First find of srilankite in the Urals. Doklady Earth Sciences 470, 957–960.
Sri Lanka (TL)
 
  • Sabaragamuwa Province
    • Ratnapura District
Neues Jahrb.Min.,Mh.(1983) 151-157; Lapis 8(9), 17 (1983)
USA
 
  • Arizona
    • Apache Co.
      • Navajo Indian Reservation
        • Monument Valley
          • Dinnehotso
Mineralogical Record: 32: 211; Wang,L., R.C. Rouse, E.J. Essene, D.R. Peacor, and Y. Zhang (2000) Carmichaelite, a new hydroxyl-bearing titanite from Garnet Ridge, Arizona. American Mineralogist: 85: 792-800. Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 8.
Mineral and/or Locality  
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