UM1983-21-SiO:AlH
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Formula:
Al1.25-2Si1-1.2O5.0-0.3H2O
Colour:
brown to light brown
Reported as "Mineral 3"; compositionally very variable. Forms felted patches.
Found in quartz-muscovite-biotite-garnet-staurolite-sillimanite gneisses, together with 'UM1983-20-SiO:AlH' ("Mineral 1") and 'UM1983-19-SiO:AlH' ("Mineral 2").
Occurrence of these three phases is supposed to confirm the multi-stage formation of
sillmanite from kaolinite.
Found in quartz-muscovite-biotite-garnet-staurolite-sillimanite gneisses, together with 'UM1983-20-SiO:AlH' ("Mineral 1") and 'UM1983-19-SiO:AlH' ("Mineral 2").
Occurrence of these three phases is supposed to confirm the multi-stage formation of
sillmanite from kaolinite.
Unique Identifiers
Mindat ID:
47743
Long-form identifier:
mindat:1:1:47743:9
Similar Names
| UM1958-04-SiO:AlHK | K2Al3Si7O18(OH,F)3 | |
| UM1959-04-SiO:AlH | ||
| UM1983-19-SiO:AlH | (Al2O3)2-4.5(SiO2)3-5(H2O)0-1.5 | |
| UM1983-20-SiO:AlH | Al2Si2O7 · 4H2O | |
| UM1987-12-SO:AlH | Al3(SO4)2(OH)5 · 9H2O | |
| UM1987-13-SO:AlH | Al2(SO4)3 · 12H2O ? | |
| UM1994-27-SiO:AlK | A synonym of Liebermannite | KAlSi3O8 |
Physical Properties of UM1983-21-SiO:AlH
Colour:
Brown to light brown
Chemistry of UM1983-21-SiO:AlH
Mindat Formula:
Al1.25-2Si1-1.2O5.0-0.3H2O
Element Weights:
Elements listed:
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 UM1983-21-SiO:AlH
mindat.org URL:
https://www.mindat.org/min-47743.html
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References for UM1983-21-SiO:AlH
Reference List:
Stanton, R. L. (1983) The direct derivation of sillimanite from a kaolinitic precursor: evidence from the Geco Mine, Manitouwadge, Ontario. Economic Geology, 78 (3). 422-437 doi:10.2113/gsecongeo.78.3.422(in: Dunn, P.J., Grice, J.D., Fleischer, M., Pabst, A. (1984): New mineral names. American Mineralogist: 69: 213)
Localities for UM1983-21-SiO:AlH
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.
Canada | |
| Stanton (1983) +1 other reference |
