Tistarite Mineral Data
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:
Ti1.9 O3 Al0.04 Zr0.01 Mg0.07
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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3 c
X Ray Diffraction:
By Intensity(I/Io ): 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),
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:
PETistarite = 11.59 barns/electronU=PETistarite x r Electron 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 3 c 3 2/m
04.03.01.02 Hematite Fe2O3 R 3 c 3 2/m
04.03.01.03 Eskolaite Cr2O3 R 3 c 3 2/m
04.03.01.04 Karelianite V2O3 R 3 c 3 2/m
04.03.01.05 Tistarite ! Ti2O3 R 3 c 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 3 c 3 2/m
04.CB.05 Eskolaite Cr2O3 R 3 c 3 2/m
04.CB.05 Hematite Fe2O3 R 3 c 3 2/m
04.CB.05 Karelianite V2O3 R 3 c 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 3 c 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:
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