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Stradner Kogel, Wilhelmsdorf, Bad Gleichenberg, Styria, Austria
© Fritz Schreiber
Note: halloysite-10Å is not a polytype of halloysite.
It is an approved (grandfathered) species distinct from halloysite-7Å.
Synonyms are "endellite" (name for halloysite-10Å in European literature; discredited in 2006), "hydrated halloysite" and "hydrohalloysite."
Further localities are listed under "endellite".
Classification of Halloysite-10Å
|IMA status:||Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"|
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Type Occurrence of Halloysite-10Å
|Type Locality:||Angleur, Liège, Liège Province, Belgium|
Crystallography of Halloysite-10Å
|Class (H-M):||m - Domatic|
|Cell Parameters:||a = 5.1Å, b = 8.9Å, c = 10.25Å|
β = 100.2°
|Ratio:||a:b:c = 0.573 : 1 : 1.152|
|Unit Cell Volume:||V 457.89 Å³ (Calculated from Unit Cell)|
|Comment:||Space group Cc.|
|X-Ray Powder Diffraction:|
Chemical Properties of Halloysite-10Å
|Simplified for copy/paste:||Al2Si2O5(OH)4·2H2O|
|Essential elements:||Al, H, O, Si|
|All elements listed in formula:||Al, H, O, Si|
Other Names for Halloysite-10Å
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Halloysite-10Å
American Mineralogist 28 (1943), 1
Am. Mineral. 40 (1955) 1110
Powder Diffraction File (International Center for Diffraction Data) 29-1489
Clays and Clay Minerals 26 (1978), 25
Powder Diffraction 4 (1989), 19
Internet Links for Halloysite-10Å
Localities for Halloysite-10Å
The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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New Locality Added: Pactolus Hills, Athens District, Cedar Mts, Nye Co., Nevada, USAFrom Chester S. Lemanski, Jr., 22nd Nov 2014 00:22:11