Geikielite Mineral Data + Say GEIKIELITE


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General Geikielite Information
Help on Chemical Formula: Chemical Formula: MgTiO3
Help on Composition: Composition: Molecular Weight = 120.18 gm
   Magnesium  20.22 %  Mg   33.54 % MgO
   Titanium   39.84 %  Ti   66.46 % TiO2
   Oxygen     39.94 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: MgTiO3
Help on Environment: Environment: Forms during contact metamorphism of impure magnesian limestones. Also in carbonatites, kimberlites, and serpentinized ultramafic rocks. Forms a series with ilmenite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1892
Help on Locality: Locality: Gem gravels of the Rakwana and Balanoda districts, Sri Lanka. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Sir Archibald Geikie (1835-1924), Scottish geologist and Director-General of the Geological Survey of Great Brition.
Help on Synonym: Synonym: ICSD 65794
  PDF 6-494
 

Geikielite Image

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Geikielite

Comments: Black, lustrous crystals of geikielite in matrix.
Location: Monte dei tre Abati, Coli, Piacenza Province, Emilia-Romagna, Italy. Scale: Picture size 2.2 mm.
© Thomas Witzke / Abraxas-Verlag

Geikielite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:2.77093
Help on Cell Dimensions: Cell Dimensions: a = 5.086, c = 14.093, Z = 6; V = 315.71 Den(Calc)= 3.79
Help on Crystal System: Crystal System: Trigonal - RhombohedralH-M Symbol ( 3) Space Group: R 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.722(1), 2.218(0.7), 2.527(0.55),
Click Here for Large Geikielite Structure Window Crystal Structure:

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Liferovich R P , Mitchell R H , Physics and Chemistry of Minerals , 32 (2005) p.442-449, Rhombohedral ilmenite group nickel titanates with Zn, Mg, and Mn:, synthesis and crystal structures

View Additional jPOWD Structure files for Geikielite
[1]
 

Physical Properties of Geikielite

Help on Cleavage: Cleavage: [1011] Distinct
Help on Color: Color: Bluish black, Brownish black.
Help on Density: Density: 4
Help on Diaphaniety: Diaphaniety: Translucent to opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: purple brown
 

Optical Properties of Geikielite

Help on Dichroism (e): Dichroism (e): brownish red or purplish red.
Help on Dichroism (w): Dichroism (w): pinkish red or pinkish red.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.126 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.078 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.3028,KPDmeas= 0.2869,KC= 0.3283
Help on Optical Data: Optical Data: Uniaxial (-), e=1.95-1.98, w=2.31-2.35, bire=0.3600-0.3700.
Help on RL Anisotrophism: RL Anisotrophism: Strong, purplish red.
Help on RL Color: RL Color: Gray with red internal reflections.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Geikielite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 400 nm   17.70   13.90 
   
 420 nm   17.20   13.50 
 440 nm   16.80   13.10 
 460 nm   16.40   12.80 
 480 nm   16.10   12.40 
 500 nm   15.80   12.20 
 520 nm   15.50   12.00 
 540 nm   15.40   11.80 
 560 nm   15.30   11.80 
 580 nm   15.20   11.80 
 600 nm   15.20   11.70 
 620 nm   15.20   11.80 
 640 nm   15.30   11.80 
 660 nm   15.30   11.80 
 680 nm   15.40   11.80 
 700 nm   15.40   11.80 
Calculated Relative Intensity Colors of Geikielite in Air
Relative
Intensity		    0%   80% 100% 160% 240% 320% 400% 480% 560% 640% 720% 740%
R1                        
R2                        
 

Calculated Properties of Geikielite

Help on Electron Density: Electron Density:

relectron=3.66 gm/cc
note: rGeikielite =3.79 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.07192
Boson Index = 0.92808
Help on Photoelectric: Photoelectric:

PEGeikielite = 7.03 barns/electron
U=PEGeikielite x relectron= 25.73 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Geikielite is Not Radioactive
 

Geikielite Classification
Help on Dana Class: Dana Class: 4.3.5.2 (4)Simple Oxides
  (4.3)with a cation charge of 3+ (A+++2 O3)
  (4.3.5)Dana Group
 
4.3.5.1 Ilmenite FeTiO3 R 3 3
 
4.3.5.2 Geikielite MgTiO3 R 3 3
 
4.3.5.3 Pyrophanite MnTiO3 R 3 3
 
4.3.5.4 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3
 
4.3.5.5 Melanostibite Mn(Sb,Fe)O3 R 3 3
 
4.3.5.6 Brizziite-III NaSbO3 R 3 3
 
4.3.5.7 Akimotoite! (Mg,Fe)SiO3 R 3 3
Help on Strunz Class: Strunz Class: IV/C.05-10 IV - Oxides
  IV/C - Oxides with metal : oxygen = 2:3 (M2O3 and related compounds)
  IV/C.05 - Ilmenite group, Geikilith - Brizziite series
 
IV/C.05-05 Akimotoite! (Mg,Fe)SiO3 R 3 3
 
IV/C.05-10 Geikielite MgTiO3 R 3 3
 
IV/C.05-20 Ilmenite FeTiO3 R 3 3
 
IV/C.05-30 Pyrophanite MnTiO3 R 3 3
 
IV/C.05-40 Ecandrewsite (Zn,Fe,Mn)TiO3 R 3 3
 
IV/C.05-50 Melanostibite Mn(Sb,Fe)O3 R 3 3
 
IV/C.05-60 Brizziite-III NaSbO3 R 3 3
 
IV/C.05-60* Brizziite-VII NaSbO3 R 3 3
 

Other Geikielite Information
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Geikielite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Geikielite

MgTiO3
Dana No: 4.3.5.2 Strunz No: IV/C.05-10
Locality:

 

Notes:

 
 
   
 
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