Halloysite
Image
Optical micrograph of Halloysite [Al2Si2O5(OH)4] in 'P-0433 Halloysite' standard (CSIRO) from Beez, Namur Province, Belgium. Instrument: Olympus BX-51. Date: November 2024.
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Properties
| Formula | Al2Si2O5(OH)4 |
| Abbreviation | Hly-7Å |
| Classification | Kaolinite (subgroup) |
| IMA Status | Grandfathered (pre-IMA), 1826 |
| Search other databases | webmineral.com, mindat.org, rruf.info, mineralienatlas.de, Handbook of Mineralogy, American Mineralogist Crystal Structure Database |
| Related materials | Dickite, Halloysite-7Å, Kaolinite, Nacrite |
| Crystal symmetry | Monoclinic, Point group m, Space group Cc (#9) |
| Tags | Hydroxide , Mineral, Aluminosilicate |
Composition
| Element | Atoms |
|---|---|
| O | 9 |
| H | 4 |
| Si | 2 |
| Al | 2 |
| Total: | 17 |