Mineralogy Database

Armalcolite Mineral Data

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General Armalcolite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++)Ti2O5
Help on Composition: Composition: Molecular Weight = 207.95 gm
   Magnesium   8.77 %  Mg   14.54 % MgO
   Titanium   46.05 %  Ti   76.83 % TiO2
   Iron        6.71 %  Fe    8.64 % FeO
   Oxygen     38.47 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg0.75Fe2+0.25Ti2O5
Help on Environment: Environment: Ti oxides associated with deep-seated intrusives.
Help on IMA Status: IMA Status: Approved IMA 1970
Help on Locality: Locality: Tranquillity Base, Moon. Smoky Butte, Garfield Co., MT, Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the three astronauts of Apollo 11: Neil A. ARMstrong, Edwin E. "Buzz" ALdrin, and Michael COLlins.
Help on Name Pronunciation: Name Pronunciation: Armalcolite + Pronunciation Say ARMALCOLITE
Help on Synonym: Synonym: ICSD 15845
  Kennedyite - Discredited IMA 1988
  PDF 41-1444
 

Armalcolite Image

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  Armalcolite

Comments: Gray semi-metallic armalcolite micro crystals on coal.
Location: Chelyabinsk Oblast', Urals Region, Russia. Scale: See Image.
© Rruff Database

Armalcolite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9786:1:0.3745
Help on Cell Dimensions: Cell Dimensions: a = 9.77, b = 9.983, c = 3.739, Z = 4; V = 364.68 Den(Calc)= 3.79
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Bbmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.468(1), 1.958(0.8), 2.763(0.25),
 

Physical Properties of Armalcolite

Help on Color: Color: Gray.
Help on Density: Density: 4
Help on Diaphaneity: Diaphaneity: Opaque
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Metallic
 

Optical Properties of Armalcolite

Help on Optical Data: Optical Data: Biaxial (?)
  NCalc= 2.32 - from Gladstone-Dale relationship (KC = 0.3472) where Ncalc=Dcalc*KC+1
NCalc= 2.39 - from Gladstone-Dale relationship (KC = 0.3472) where Ncalc=Dmeas*KC+1
Help on RL Anisotrophism: RL Anisotrophism: Strong, pale gray to dark bluish gray.
Help on RL Color: RL Color: Gray to tan.
Help on RL Pleochroism: RL Pleochroism: Observed.
Help on Reflectivity Reflectivity
Standardized Intensity (100%) Reflection Spectra of Armalcolite in Air
λ R1 R2  ∑ R1(λ)   ∑ R2(λ) 
 450 nm   14.10   15.20 
   
 470 nm   14.00   15.00 
 500 nm   13.80   14.70 
 520 nm   13.70   14.50 
 546 nm   13.40   14.40 
 586 nm   13.30   14.30 
 620 nm   13.20   14.20 
 640 nm   13.00   14.10 
Calculated Relative Intensity Colors of Armalcolite in Air
Relative
Intensity
   0%   70% 100% 140% 210% 280% 350% 420% 490% 560% 630% 670%
R1                        
R2                        
 

Calculated Properties of Armalcolite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Armalcolite =3.79 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEArmalcolite = 9.90 barns/electron
U=PEArmalcolite x rElectron Density= 35.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Armalcolite is Not Radioactive
 

Armalcolite Classification

Help on  Dana Class: Dana Class: 07.07.01.02 (07)Multiple Oxides
  (07.07)with miscellaneous formulae
  (07.07.01)Dana Group
 
07.07.01.01 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 
07.07.01.02 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
07.07.01.03 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 04.CB.15 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.15 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m
 
04.CB.15 Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex
 
04.CB.15 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m
 

Other Armalcolite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3)
Help on See Also: See Also: Links to other databases for Armalcolite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - University of Colorado - Mineral Structure Data
16 - WWW-MINCRYST

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Armalcolite

(Mg,Fe++)Ti2O5
Dana No: 07.07.01.02 Strunz No: 04.CB.15
Locality:

 

Notes:

 

 
   
 


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