Srilankite Mineral Data

Srilankite Mineral Data +

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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.

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
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

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:

r_electron=4.30 gm/cc
note: r_Srilankite=4.59 gm/cc.

Fermion Index

Fermion Index = 0.07956
Boson Index = 0.92044

Photoelectric:

PE_Srilankite= 41.20 barns/electron
U=PE_Srilankite x r_electron= 177.21 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Srilankite is Not Radioactive

Srilankite Classification

Dana Class:

4.4.13.2 (4)Simple Oxides

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

(4.4.13)Dana Group

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

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

Strunz Class:

IV/D.15-20 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.15 - Brookite - Kuranakhite series

IV/D.15-10 Brookite TiO2 Pcab 2/m 2/m 2/m

IV/D.15-20 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m

IV/D.15-25 Carmichaelite! (Ti,Cr,Fe)[O2-x(OH)x],x~0.5 P 2₁/c 2/m

IV/D.15-30 Tellurite TeO2 P bca 2/m 2/m 2/m

IV/D.15-40 Scrutinyite PbO2 P bcn 2/m 2/m 2/m

IV/D.15-50 Kuranakhite PbMnTeO6 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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

Srilankite

(Ti,Zr)O2
Dana No: 4.4.13.2 Strunz No: IV/D.15-20
Locality:

Notes: