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Armalcolite Mineral Data
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General Armalcolite Information
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 Chemical Formula: |
(Mg,Fe++)Ti2O5 |
| Composition: |
Molecular Weight = 207.95 gm |
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Magnesium 8.77 % Mg 14.54 % MgO |
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Titanium 46.05 % Ti 76.83 % TiO2 |
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Iron 6.71 % Fe 8.64 % FeO |
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Oxygen 38.47 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
Mg0.75Fe2+0.25Ti2O5 |
| Environment: |
Ti oxides associated with deep-seated intrusives. |
| IMA Status: |
Approved IMA 1970 |
| Locality: |
Tranquillity Base, Moon. Smoky Butte, Garfield Co., MT, Link to MinDat.org Location Data. |
| Name Origin: |
Named after the three astronauts of Apollo 11: Neil A. ARMstrong, Edwin E. "Buzz" ALdrin, and Michael COLlins. |
| Name Pronunciation: |
Armalcolite + Pronunciation  |
| Synonym: |
ICSD 15845 |
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Kennedyite - Discredited IMA 1988 |
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PDF 41-1444 |
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Armalcolite Image |
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Images:
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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 |
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Armalcolite Crystallography
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| Axial Ratios: |
a:b:c =0.9786:1:0.3745 |
| Cell Dimensions: |
a = 9.77, b = 9.983, c = 3.739, Z = 4; V = 364.68 Den(Calc)= 3.79 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Bbmm |
| X Ray Diffraction: |
By Intensity(I/Io): 3.468(1), 1.958(0.8), 2.763(0.25), |
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Physical Properties of Armalcolite
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| Color: |
Gray. |
| Density: |
4 |
| Diaphaneity: |
Opaque |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Metallic |
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Optical Properties of Armalcolite
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| Optical Data: |
Biaxial (?) |
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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
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| RL Anisotrophism: |
Strong, pale gray to dark bluish gray. |
| RL Color: |
Gray to tan. |
| RL Pleochroism: |
Observed. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Armalcolite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 450 nm |
14.10 |
15.20 |
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| 470 nm |
14.00 |
15.00 |
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| 500 nm |
13.80 |
14.70 |
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| 520 nm |
13.70 |
14.50 |
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| 546 nm |
13.40 |
14.40 |
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| 586 nm |
13.30 |
14.30 |
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| 620 nm |
13.20 |
14.20 |
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| 640 nm |
13.00 |
14.10 |
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Calculated Relative Intensity Colors of Armalcolite in Air
Relative
Intensity |
0% |
70% |
100% |
140% |
210% |
280% |
350% |
420% |
490% |
560% |
630% |
670% |
| R1 |
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| R2 |
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Calculated Properties of Armalcolite
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| Electron Density: |
Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Armalcolite =3.79 gm/cc.
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| Fermion Index: |
Fermion Index = 0.06
Boson Index = 0.94 |
| Photoelectric: |
PEArmalcolite = 9.90 barns/electron
U=PEArmalcolite x rElectron Density= 35.91 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Armalcolite is Not Radioactive |
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Armalcolite Classification
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| Dana Class: |
07.07.01.02 (07)Multiple Oxides |
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(07.07)with miscellaneous formulae |
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(07.07.01)Dana Group |
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07.07.01.01 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m |
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07.07.01.02 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m |
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07.07.01.03 IMA2000-016! (Ti,Fe,Mg,Mn)1-xTi2O5 Pban 2/m 2/m 2/m |
| Strunz Class: |
04.CB.15 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate |
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04.C - Metal:Oxygen = 2:3, 3:5, and Similar |
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04.CB -With medium-sized cations |
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04.CB.15 Armalcolite (Mg,Fe)Ti2O5 Bbmm 2/m 2/m 2/m |
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04.CB.15 Mongshanite* (Mg,Cr,Fe)2(Ti,Zr)5O12 Unk Hex |
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04.CB.15 Pseudobrookite (Fe,Fe)2(Ti,Fe)O5 Bbmm 2/m 2/m 2/m |
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Other Armalcolite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic3) |
| 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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