UM1996-16-O:Al
Valid as an unnamed mineral
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Formula:
η-Al2O3
Polymorph of:
Yet another natural polymorph of aluminium(III) oxide.
Constitutes cores of pisoliths and stands for 20wt.% of a bauxite; a poorly diffracting material. The grain size is 9 nm.
Associates: anatase, gibbsite, hematite, kaolinite, rutile.
TEM-EDS data, wt.:
SiO2 0.6–1.4
TiO2 0.7–1.1
Fe2O3 2.2–3.1
Al2O3 95.1–96.4
Constitutes cores of pisoliths and stands for 20wt.% of a bauxite; a poorly diffracting material. The grain size is 9 nm.
Associates: anatase, gibbsite, hematite, kaolinite, rutile.
TEM-EDS data, wt.:
SiO2 0.6–1.4
TiO2 0.7–1.1
Fe2O3 2.2–3.1
Al2O3 95.1–96.4
Unique Identifiers
Mindat ID:
54062
Long-form identifier:
mindat:1:1:54062:9
Similar Names
| UM1990-23-O:Al | θ-Al2O3 | |
| UM1990-24-O:Al | Valid as an unnamed mineral | σ-Al2O3 |
| UM1995-15-O:Al | Valid as an unnamed mineral | χ-Al2O3 |
IMA Classification of UM1996-16-O:Al
IMA status notes:
Unnamed (probably valid)
Chemistry of UM1996-16-O:Al
Mindat Formula:
η-Al2O3
Elements listed:
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 4.62 Å | (10) |
| 2.82 Å | (30) |
| 2.45 Å | (80) |
| 2.29 Å | (20) |
| 2.01 Å | (90) |
| 1.55 Å | (20) |
| 1.41 Å | (100) |
Comments:
after subtraction of reflections attributable to the associates; well correspondence to synthetic synthetic η-Al2O3
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for UM1996-16-O:Al
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References for UM1996-16-O:Al
Reference List:
Tilley, David B. (1996) The Natural Occurrence of Eta-Alumina (η-Al2O3) in Bauxite. Clays and Clay Minerals, 44 (5) 658-664 doi:10.1346/ccmn.1996.0440508(Abs. in: Jambor, J.L., Puziewicz, J., Roberts, A.C. (1997): New mineral names. American Mineralogist: 82: 623)
Localities for UM1996-16-O:Al
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Australia | |
| Tilley (1996) +1 other reference |
