Srilankite Mineral Data

General Srilankite Information

Chemical Formula:

(Ti,Zr)O2

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

Empirical Formula:

Ti_0.75Zr_0.25O₂

Environment:

In pebbles found in concentrated from a placer gemstone mine.

IMA Status:

Approved IMA 1983

Locality:

Rakwana mine, Sabaragamuva, Sri Lanka. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Srilankite + Pronunciation

Synonym:

ICSD 69619

PDF 46-1265

Srilankite Image

Images:

Srilankite

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

Axial Ratios:

a:b:c =0.8478:1:0.9038

Cell Dimensions:

a = 4.708, b = 5.553, c = 5.019, Z = 4; V = 131.21 Den(Calc)= 4.59

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P bcn

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.92(1), 1.516(0.35), 1.721(0.3),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Willgallis A , Hartl H , Zeitschrift fur Kristallographie , 164 (1983) p.59-66, (Zr0.33Ti0.67)O2 - ein naturliches zirkonium-titanoxid mit alpha-PbO2-struktur, Locality: Rakwana, Sri Lanka

Physical Properties of Srilankite

Cleavage:

{???} Poor

Color:

Black.

Density:

4.765

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

6.5 - Pyrite

Luster:

Adamantine - Metallic

Optical Properties of Srilankite

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

Optical Data:

Biaxial (-), a=2.38, 2V(Meas)=16. Dispersion high birefringence.

Pleochroism (x):

dark blue.

RL Anisotrophism:

Observed.

RL Color:

Gray-white.

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**
Relative Intensity	0%	60%	100%	120%	180%	240%	300%	360%	420%	480%	530%
R₁
R₂

Calculated Properties of Srilankite

Electron Density:

Bulk Density (Electron Density)=4.30 gm/cc
note: Specific Gravity of Srilankite =4.59 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Srilankite= 41.20 barns/electron
U=PE_Srilankite x rElectron Density= 177.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Srilankite is Not Radioactive

Srilankite Classification

Dana Class:

04.04.13.02 (04)Simple Oxides

(04.04)with a cation charge of 4+ (A++++ O2)

(04.04.13)Dana Group

04.04.13.01 Tazheranite CaTiZr2O8 F m3m 4/m 3 2/m

04.04.13.02 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)

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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Srilankite Specimen Label here :

Srilankite

(Ti,Zr)O2
Dana No: 04.04.13.02 Strunz No: 04.DB.25
Locality:

Notes: