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UM1995-15-O:Al

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Formula:
χ-Al2O3
Crystal System:
Hexagonal
The chi polymorph of Al2O3.

In dense lateritic pisolites, with other minerals listed for this locality, as extremely hard interstitial phase. Cut by and locally recrystallized to corundum.

Optically isotropic.

Electron microprobe analysis results, wt.%: Al2O3 97, SiO2 <0.2, TiO2 <0.2, Fe2O3 3.

According to Paglia (2004), the chi polymorph forms, concurrently with böhmite, due to gibbsite heating. The transformation of the latter to the chi-Al2O3 takes place at 340 oC.


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Classification of UM1995-15-O:AlHide

Notes:
Unnamed (probably valid)

Chemical Properties of UM1995-15-O:AlHide

Formula:
χ-Al2O3

Crystallography of UM1995-15-O:AlHide

Crystal System:
Hexagonal
Comment:
"six-coordinated layered structure"; from: Sōmiya et al. (2003)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
2.38(
2.28(
2.13(
1.99(
1.39(

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for UM1995-15-O:AlHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Singh, B., Gilkes, R.J. (1995): The natural occurrence of χ-alumina in lateritic pisolites. Clay Minerals, 30, 39-44; in: Jambor, J.L., Puziewicz, J., Roberts, A.C (1995): New mineral names. American Mineralogist: 80: 1331
Sōmiya, S., Aldinger, F., Klaussen, N., Spriggs, R.M., Uchino, K., Koumoto, K., Kaneno, M. (2003): Handbook of Advanced Ceramics, Vol. I: Materials Science, Elsevier Inc. (Academic Press imprint), London, UK / San Diego, CA, USA, 788 pp.
Smith, D.G.W., Nickel, E.H. (2007): A System of Codification for Unnamed Minerals: Report of the SubCommittee for Unnamed Minerals of the IMA Commission on New Minerals, Nomenclature and Classification. Canadian Mineralogist: 45: 983-1055; http://nrmima.nrm.se (2016)

Internet Links for UM1995-15-O:AlHide

Localities for UM1995-15-O:AlHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Australia
 
  • Western Australia
Singh, B., Gilkes, R.J. (1995): The natural occurrence of χ-alumina in lateritic pisolites. Clay Minerals, 30, 39-44; in: Jambor, J.L., Puziewicz, J., Roberts, A.C (1995): New mineral names. American Mineralogist: 80: 1331
 
Mineral and/or Locality  
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