Armalcolite R110187

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Record 2 of 3  

Name: Armalcolite
RRUFF ID: R110187
Ideal Chemistry: (Mg,Fe2+)Ti2O5
Locality: Synthetic
Source: Hexiong Yang
Owner: RRUFF
Description: Transparent euhedral single crystal, synthesized at 1223 deg C with K2WO4 flux. Reheated to 600 deg C for 35 days, and quenched. The Mg and Ti are ordered. Crystals were used in the Yang and Hazen (1998) & the Liermann et al (2006) studies.
Status: The identification of this mineral is confirmed by single-crystal X-ray diffraction and chemical analysis.
Mineral Group: [ Pseudobrookite (6) ]
Quick search: [ All Armalcolite samples (3) ]
CHEMISTRY 
RRUFF ID: R110187.2
Sample Description: Microprobe Fragment
Measured Chemistry: Mg0.995(6)Ti2.005(5)O5
RAMAN SPECTRUM 
RRUFF ID:
Sample Description: Unoriented Raman on the primary sample
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BROAD SCAN WITH SPECTRAL ARTIFACTS
RRUFF ID: R110187
Wavelength:
Sample Description: Unoriented Raman on the primary sample
Instrument settings: Thermo Almega XR 532nm @ 100% of 150mW
POWDER DIFFRACTION 
RRUFF ID: R110187.9
Sample Description: Single crystal, powder profile is calculated
Cell Refinement Output: a: 9.7115(5)Å    b: 10.0189(3)Å    c: 3.7362(2)Å
alpha: 90°    beta: 90°    gamma: 90°   Volume: 363.52(3)Å3    Crystal System: orthorhombic
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Calculated diffraction file.

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Output file from the Bruker D8 Advance instrument. Includes device headers and XY data.

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REFERENCES for Armalcolite

American Mineralogist Crystal Structure Database Record: [view record]

Anthony J W, Bideaux R A, Bladh K W, and Nichols M C (1990) Handbook of Mineralogy, Mineral Data Publishing, Tucson Arizona, USA, by permission of the Mineralogical Society of America. [view file]

Anderson A T, Bunch T E, Cameron E N, Haggerty S E, Boyd F R, Finger L W, James O B, Keil K, Prinz M, Ramdohr P, El Goresy A (1970) Armalcolite: a new mineral from the Apollo 11 samples, Geochimica et Cosmochimica Acta Supplement, Proceedings of the Apollo 11 Lunar Science Conference, 1, 55-63   [view file]

Fleischer M (1970) New mineral names, American Mineralogist, 55, 2135-2139   [view file]

Bowles J F W (1988) Definition and range of composition of naturally occurring minerals with the pseudobrookite structure, American Mineralogist, 73, 1377-1383   [view file]

Wechsler B A, Von Dreele R B (1989) Structure refinement of Mg2TiO4, MgTiO3 and MgTi2O5 by time-of-flight neutron powder diffraction, Acta Crystallographica, B45, 542-549

Hayob J L, Essene E J (1995) Armalcolite in crustal paragneiss xenoliths, central Mexico, American Mineralogist, 80, 810-822   [view file]

Yang H, Hazen R M (1998) Crystal chemistry of cation order-disorder in pseudobrookite-type MgTi2O5, Journal of Solid State Chemistry, 138, 238-244

Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry karrooite, MgTi2O5, with different ordering states, American Mineralogist, 84, 130-137   [view file]

Liermann H-P, Downs R T, Yang H (2006) Site disorder revealed through Raman spectra from oriented single crystals: a case study on karooite (MgTi2O5), American Mineralogist, 91, 790-793   [view file]

Lennie A R, Knight K S, Henderson C M B (2007) Cation ordering in MgTi2O5 (karrooite): probing temperature dependent effects with neutrons, American Mineralogist, 92, 1165-1180   [view file]

Sevillano G C, Viñals J, Rebollar M C (2009) Minerales de la vesículas de las Rocas lamproíticas del Afloramiento de la Aljorra (Murcia), Revista de la Sociedad Española de Mineralogia, 11, 43-44   [view file]