General Srilankite Information
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Chemical Formula: |
(Ti,Zr)O2 |
Composition: |
Molecular Weight = 90.71 gm |
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Zirconium 25.14 % Zr 33.96 % ZrO2 |
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Titanium 39.59 % Ti 66.04 % TiO2 |
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Oxygen 35.27 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
Ti0.75Zr0.25O2 |
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 |
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PDF 46-1265 |
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Srilankite Image |
Images:
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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 |
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Srilankite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 2.92(1), 1.516(0.35), 1.721(0.3), |
Crystal Structure:
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drag2 - RMB Resize/Rotate
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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
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Physical Properties of Srilankite
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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 |
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Optical Properties of Srilankite
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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 |
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∑ R1(λ) |
∑ R2(λ) |
| 480 nm |
19.40 |
18.60 |

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| 546 nm |
18.40 |
16.00 |

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| 589 nm |
18.50 |
16.40 |

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| 649 nm |
18.70 |
17.00 |

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Calculated Relative Intensity Colors of Srilankite in Air
Relative Intensity |
0% |
60% |
100% |
120% |
180% |
240% |
300% |
360% |
420% |
480% |
530% |
| R1 |
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| R2 |
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Calculated Properties of Srilankite
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Electron Density: |
relectron=4.30 gm/cc note: rSrilankite =4.59 gm/cc. |
Fermion Index |
Fermion Index = 0.07956 Boson Index = 0.92044 |
Photoelectric: |
PESrilankite = 41.20 barns/electron U=PESrilankite x relectron= 177.21 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Srilankite is Not Radioactive |
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Srilankite Classification
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Dana Class: |
4.4.13.2 (4)Simple Oxides |
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(4.4)with a cation charge of 4+ (A++++ O2) |
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(4.4.13)Dana Group |
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4.4.13.1 Tazheranite CaTiZr2O8 F m3m 4/m 3 2/m |
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4.4.13.2 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m |
Strunz Class: |
IV/D.15-20 IV - Oxides |
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IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds) |
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IV/D.15 - Brookite - Kuranakhite series |
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IV/D.15-10 Brookite TiO2 Pcab 2/m 2/m 2/m |
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IV/D.15-20 Srilankite (Ti,Zr)O2 P bcn 2/m 2/m 2/m |
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IV/D.15-25 Carmichaelite! (Ti,Cr,Fe)[O2-x(OH)x],x~0.5 P 21/c 2/m |
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IV/D.15-30 Tellurite TeO2 P bca 2/m 2/m 2/m |
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IV/D.15-40 Scrutinyite PbO2 P bcn 2/m 2/m 2/m |
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IV/D.15-50 Kuranakhite PbMnTeO6 Unk Ortho |
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Other Srilankite Information
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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 :
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Srilankite
(Ti,Zr)O2
Dana No: 4.4.13.2 Strunz No: IV/D.15-20
Locality:
Notes:
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