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Srilankite

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Formula:
Ti2ZrO6
System:
Orthorhombic
Colour:
Black, blackish brown
Lustre:
Sub-Adamantine, Resinous, Sub-Metallic
Hardness:
Name:
Named in 1983 by Alexander Willgallis, Eveline Siegmann, and Theja Hettiaratchi after its discovery locality at Rakwana, Sabaragamuwa Province, Sri Lanka.

Classification of Srilankite

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 Srilankite

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

Optical Data of Srilankite

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 Srilankite

IMA Formula:
Ti2ZrO6
Elements listed in formula:

Crystallography of Srilankite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbcn
Space Group 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 Volume:
V 131.21 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Tabular crystal, often twinned
Twinning:
Interpenetration and contact twins
X-Ray 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 Srilankite

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

Relationship of Srilankite to other Species

Other Members of Group:
Calciosamarskite(Ca,Fe3+,Y)2(Nb,Ta,Ti)2O8
IshikawaiteU4+Fe2+Nb2O8
Samarskite-(Y)(Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
Samarskite-(Yb)(Yb,Y,Fe3+,Fe2+,U,Th,Ca)2(Nb,Ta)2O8
4.DB.05ArgutiteGeO2
4.DB.05CassiteriteSnO2
4.DB.05PlattneritePbO2
4.DB.05PyrolusiteMnO2
4.DB.05RutileTiO2
4.DB.05TripuhyiteFe3+Sb5+O4
4.DB.05TugarinoviteMoO2
4.DB.05Varlamoffite(Sn,Fe)(O,OH)2
4.DB.10ByströmiteMgSb25+O6
4.DB.10Tapiolite-(Fe)Fe2+Ta2O6
4.DB.10Tapiolite-(Mn)Mn2+Ta2O6
4.DB.10OrdoñeziteZnSb25+O6
4.DB.15bAkhtenskiteMnO2
4.DB.15cNsutiteMnx2+Mn4+1-xO2-2x(OH)2x
4.DB.15aParamontroseiteVO2
4.DB.15aRamsdelliteMn4+O2
4.DB.20ScrutinyitePbO2
4.DB.25Ishikawaite(U,Fe,Y)NbO4
4.DB.25Ixiolite(Ta,Mn,Nb)O2
4.DB.25Samarskite-(Y)(Y,Ce,U,Fe,Nb)(Nb,Ta,Ti)O4
4.DB.25Yttrocolumbite-(Y)(Y,U,Fe2+)(Nb,Ta)O4
4.DB.25Calciosamarskite(Ca,Fe,Y)(Nb,Ta,Ti)O4
4.DB.25Samarskite-(Yb)YbNbO4
4.DB.30FerberiteFe2+WO4
4.DB.30HübneriteMn2+WO4
4.DB.30SanmartiniteZnWO4
4.DB.30KrasnoselskiteCoWO4
4.DB.30HeftetjerniteScTaO4
4.DB.30HuanzalaiteMgWO4
4.DB.35Columbite-(Fe)Fe2+Nb2O6
4.DB.35Tantalite-(Fe)Fe2+Ta2O6
4.DB.35Columbite-(Mn)Mn2+Nb2O6
4.DB.35Tantalite-(Mn)Mn2+Ta2O6
4.DB.35Columbite-(Mg)MgNb2O6
4.DB.35QitianlingiteFe22+Nb2W6+O10
4.DB.35Magnocolumbite(Mg,Fe,Mn)(Nb,Ta)2O6
4.DB.35Tantalite-(Mg)MgTa2O6
4.DB.40FerrowodginiteFe2+Sn4+Ta2O8
4.DB.40LithiotantiteLiTa3O8
4.DB.40LithiowodginiteLiTa3O8
4.DB.40TitanowodginiteMn2+TiTa2O8
4.DB.40WodginiteMn2+Sn4+Ta2O8
4.DB.40FerrotitanowodginiteFe2+TiTa2O8
4.DB.40WolframowodginiteMn(Mn,Sn,Fe,Ta)(W,Ta,Nb)2O8
4.DB.45TivaniteTiV3+O3(OH)
4.DB.50Carmichaelite(Ti,Cr,Fe)(O,OH)2
4.DB.55AlumotantiteAlTaO4
4.DB.60BiehliteSb23+MoO6
7.10.1BaddeleyiteZrO2
7.10.2ArkeliteZrO2
7.10.3PainiteCaZrAl9O15(BO3)
7.10.5Zirconolite(Ca,Y)Zr(Ti,Mg,Al)2O7
7.10.6CalzirtiteCa2Zr5Ti2O16
7.10.7Tazheranite(Zr,Ti,Ca)(O,◻)2
7.10.8Zirkelite(Ti,Ca,Zr)O2-x
7.10.9UhligiteCa3(Ti,Al,Zr)9O20 ?
7.10.10ThorianiteThO2

Other Names for Srilankite

Name in Other Languages:

Other Information

Not fluorescent in UV
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 Srilankite

Reference List:
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 Srilankite

mindat.org URL:
https://www.mindat.org/min-3737.html
Please feel free to link to this page.

Localities for Srilankite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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
    • Murmanskaja Oblast'
      • Kola Peninsula
        • 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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