Tistarite Mineral Data

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General Tistarite Information

Chemical Formula:

Ti2O3

Composition:

Molecular Weight = 142.66 gm

Magnesium 1.19 % Mg

Zirconium 0.64 % Zr

Titanium 63.77 % Ti

Aluminum 0.76 % Al

Oxygen 33.64 % O

______

100.00 %

Empirical Formula:

Ti_1.9O₃Al_0.04Zr_0.01Mg_0.07

Environment:

Found as one subhedral crystal in a cluster of micrometer-sized refractory grains along with khamrabaevite (TiC), rutile, and corundum crystals within a chondrule. Corundum group.

IMA Status:

Approved IMA 2008 (Dana # Added)

Locality:

Allende meteorite, Pueblito de Allende, Chihuahua, Mexico Link to MinDat.org Location Data.

Name Origin:

Named after the composition "Ti" and the word "star," implying that this new refractory mineral is among the first solids formed in the solar system.

Synonym:

IMA2008-016

Tistarite Image

Images:

Tistarite Khamrabaevite

Comments: BSE image showing one tistarite (Ti2O3) grain along with khamrabaevite (TiC) and corundum. The cross marks where the electron back-scattered diffraction pattern (shown in Fig. 4) was collected. (AmMin, v94:841.
Location: From inside a chondrule from the Allende meteorite. Scale: See Image.
© American Mineralogist

Tistarite Crystallography

Axial Ratios:

a:c = 1:2.63881

Cell Dimensions:

a = 5.158, c = 13.611, Z = 4; V = 313.61 Den(Calc)= 3.02

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3c

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

By Intensity(I/I_o): 1.7033(1), 2.579(0.9), 2.707(0.88),3.734(0.84), 1.489(0.46), 2.242(0.38), 1.8672(0.33), 1.5124(0.28),

Crystal Structure:

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Newnham R E , de Haan Y M , Zeitschrift fur Kristallographie , 117 (1962) p.235-237, Refinement of the alpha Al2O3, Ti2O3, V2O3 and Cr2O3 structures, Locality: synthetic

Physical Properties of Tistarite

Diaphaneity:

Opaque

Fracture:

Unknown - Minerals too small to observe fractures.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

8.5 - Chrysoberyl

Luster:

Metallic

Optical Properties of Tistarite

Optical Data:

NCalc= 1.8 - from Gladstone-Dale relationship (KC = 0.2643) where Ncalc=Dcalc*KC+1

Calculated Properties of Tistarite

Electron Density:

Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Tistarite =3.02 gm/cc.

Fermion Index:

Fermion Index = 0.08
Boson Index = 0.92

Photoelectric:

PE_Tistarite= 11.59 barns/electron
U=PE_Tistarite x rElectron Density= 33.16 barns/cc.

Radioactivity:

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

Tistarite Classification

Dana Class:

04.03.01.05 (04)Simple Oxides

(04.03)with a cation charge of 3+ (A+++2 O3)

(04.03.01)Corundum-Hematite group (Rhombohedral: R-3c)

04.03.01.01 Corundum Al2O3 R 3c 3 2/m

04.03.01.02 Hematite Fe2O3 R 3c 3 2/m

04.03.01.03 Eskolaite Cr2O3 R 3c 3 2/m

04.03.01.04 Karelianite V2O3 R 3c 3 2/m

04.03.01.05 Tistarite! Ti2O3 R 3c 3 2/m

Strunz Class:

04.CB.05 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate

04.C - Metal:Oxygen = 2:3, 3:5, and Similar

04.CB -With medium-sized cations

04.CB.05 Auroantimonate* AuSbO3 Ortho ? Ortho

04.CB.05 Geikielite MgTiO3 R 3 3

04.CB.05 Brizziite-III NaSbO3 R 3 3

04.CB.05 Brizziite-VII NaSbO3 R 3 3

04.CB.05 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3

04.CB.05 Corundum Al2O3 R 3c 3 2/m

04.CB.05 Eskolaite Cr2O3 R 3c 3 2/m

04.CB.05 Hematite Fe2O3 R 3c 3 2/m

04.CB.05 Karelianite V2O3 R 3c 3 2/m

04.CB.05 Ilmenite FeTiO3 R 3 3

04.CB.05 Melanostibite Mn(Sb,Fe)O3 R 3 3

04.CB.05 Pyrophanite MnTiO3 R 3 3

04.CB.05 Romanite* (Fe,U,Pb)2(Ti,Fe)O4 Trig ? Trig

04.CB.05 Tistarite! Ti2O3 R 3c 3 2/m

Other Tistarite Information

References:

NAME( AmMin, v94:841) PHYS. PROP.(AmMin, v94:841) OPTIC PROP.(AmMin, v94:841)

See Also:

Links to other databases for Tistarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Tistarite

Ti2O3
Dana No: 04.03.01.05 Strunz No: 04.CB.05
Locality:

Notes: