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
GUID
(UUID V4):
(UUID V4):
44be0db8-24c6-4863-bc22-3e8ce64a8f1b
Classification of UM1996-16-O:Al
IMA status notes:
Unnamed (probably valid)
Chemical Properties of UM1996-16-O:Al
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
mindat.org URL:
https://www.mindat.org/min-54062.html
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Mineral Dealers:
References for UM1996-16-O:Al
Reference List:
Localities for UM1996-16-O:Al
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
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