Mineralogy Database

Srilankite Mineral Data

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General Srilankite Information

Help on Chemical  Formula: Chemical Formula: (Ti,Zr)O2
Help on Composition: Composition: Molecular Weight = 90.71 gm
   Zirconium  25.14 %  Zr   33.96 % ZrO2
   Titanium   39.59 %  Ti   66.04 % TiO2
   Oxygen     35.27 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ti0.75Zr0.25O2
Help on Environment: Environment: In pebbles found in concentrated from a placer gemstone mine.
Help on IMA Status: IMA Status: Approved IMA 1983
Help on Locality: Locality: Rakwana mine, Sabaragamuva, Sri Lanka. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Srilankite + Pronunciation Say SRILANKITE
Help on Synonym: Synonym: ICSD 69619
  PDF 46-1265

Srilankite Image

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Comments: Backscatter electron image of srilankite (Sri) - rutile (Rt) - ilmenite (Ilm) composite grain (AmMin, v 89, p 761).
Location: Atlantis II Fracture Zone, Southwest Indian Ridge, Southern Indian Ocean. Scale: See Image.
© American Mineralogist

Srilankite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.8478:1:0.9038
Help on Cell Dimensions: Cell Dimensions: a = 4.708, b = 5.553, c = 5.019, Z = 4; V = 131.21 Den(Calc)= 4.59
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bcn
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.92(1), 1.516(0.35), 1.721(0.3),

Physical Properties of Srilankite

Help on Cleavage: Cleavage: {???} Poor
Help on Color: Color: Black.
Help on Density: Density: 4.765
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Inclusions - Generally found as inclusions in other minerals.
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luster: Luster: Adamantine - Metallic

Optical Properties of Srilankite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.092 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3007,KPDmeas= 0.2896,KC= 0.3312
Ncalc = 2.52 - 2.58
Help on Optical Data: Optical Data: Biaxial (-), a=2.38, 2V(Meas)=16. Dispersion high birefringence.
Help on Pleochroism (x): Pleochroism (x): dark blue.
Help on RL Anisotrophism: RL Anisotrophism: Observed.
Help on RL Color: RL Color: Gray-white.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Srilankite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 480 nm   19.40   18.60 
 546 nm   18.40   16.00 
 589 nm   18.50   16.40 
 649 nm   18.70   17.00 
Calculated Relative Intensity Colors of Srilankite in Air
   0%   60% 100% 120% 180% 240% 300% 360% 420% 480% 530%

Calculated Properties of Srilankite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Srilankite =4.59 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PESrilankite = 41.20 barns/electron
U=PESrilankite x rElectron Density= 177.21 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Srilankite is Not Radioactive

Srilankite Classification

Help on  Dana Class: Dana Class: (04)Simple Oxides
  (04.04)with a cation charge of 4+ (A++++ O2)
  (04.04.13)Dana Group Tazheranite CaTiZr2O8 F m3m 4/m 3 2/m Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.DB.25 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.D - Metal:Oxygen = 1:2 and similar
  04.DB -With medium-sized cations; chains of edge-sharing octahedra
04.DB.25 Ixiolite (Ta,Nb,Sn,Mn,Fe)O2 P 2/c 2/m
04.DB.25 Ishikawaite (U,Fe,Y,Ca)(Nb,Ta)O4(?) Unk Ortho
04.DB.25 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m
04.DB.25 Samarskite-(Y) (Y,Fe,U)(Nb,Ta)5O4 P bcn 2/m 2/m 2/m
04.DB.25 Samarskite-(Yb)! (Yb,Y,REE,U,Th,Ca,Fe)(Nb,Ta,Ti)O4 P 2/c 2/m
04.DB.25 Yttrocolumbite-(Y) (Y,U,Fe)(Nb,Ta)O4 Unk Ortho

Other Srilankite Information

Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Srilankite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 04.DB.25





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