Srilankite Mineral Data +

John Betts Fine Minerals

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:	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
	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
X Ray Diffraction:	By Intensity(I/Io): 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:	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
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 Search for Srilankite using:   Web webmineral.com [ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO] Visit our Advertisers for Srilankite : AA Mineral Specimens B & L Fine Minerals Crystal Vaults Dan Weinrich Fine Minerals Dan Weinrich Auctions e-Rocks Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals Rockshop.cz T G Fine Minerals Wrights Rock Shop Translate Srilankite Mineral Data : Ask about Srilankite here : Ask-A-Mineralogist from the Mineralogical Society of America Mindat.org's Discussion Groups Original Rockhounds Discussion Group Rockhounds Discussion Group on Yahoo Groups Mineral Discussion Forum from Fabre Minerals - also available in Español 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: