| |
 |
Armalcolite Mineral Data
|
|
|
General Armalcolite Information
|
 Chemical Formula: |
(Mg,Fe++)Ti2O5 |
| 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 |
| 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 |
| |
Kennedyite - Discredited IMA 1988 |
| |
PDF 41-1444 |
| |
Armalcolite Image |
|
Images:
|
|
Armalcolite
Comments: Gray semi-metallic armalcolite micro crystals on coal.
Location: Chelyabinsk Oblast', Urals Region, Russia.
Scale: See Image.
© Rruff Database |
|
Armalcolite Crystallography
|
| 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), |
| |
Physical Properties of Armalcolite
|
| Color: |
Gray. |
| Density: |
4 |
| Diaphaneity: |
Opaque |
| Habit: |
Granular - Generally occurs as anhedral to subhedral crystals in matrix. |
| Hardness: |
6 - Orthoclase |
| Luster: |
Metallic |
| |
Optical Properties of Armalcolite
|
| 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
|
| 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 |
 |
∑ 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
|
| Electron Density: |
Bulk Density (Electron Density)=3.63 gm/cc
note: Specific Gravity of Armalcolite =3.79 gm/cc.
|
| 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.
|
| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Armalcolite is Not Radioactive |
| |
Armalcolite Classification
|
| 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 |
| 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
|
| 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
Search for Armalcolite using:
[AOL]
[Bing]
[Dog Pile]
[GeoScienceWorld]
[HotBot]
[Ixquick]
[Lycos]
[MAMMA]
[Scirus]
[Teoma]
[WebCrawler]
[Wikipedia]
[YAHOO]
Visit our Advertisers for Armalcolite :
Ask about Armalcolite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in
Espa�ol
Print or Cut-and-Paste your Armalcolite Specimen Label here :
|
Armalcolite
(Mg,Fe++)Ti2O5
Dana No: 07.07.01.02 Strunz No: 04.CB.15
Locality:
Notes:
|
|
| |
| |
|
| |
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.