Juansilvaite
Juansilvaite is a very rare,[1] complex arsenate-sulfate mineral with formula Na5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2·4H2O.[2] It is both hydroxyarsenate and dihydroxyarsenate. It is among few relatively new minerals from the Torrecillas mine in Chile, the other being torrecillasite, canutite, chongite, gajardoite, leverettite, and magnesiokoritnigite.[3] Although having quite common among minerals space group C2/c, juansilvaite has a new type of structure.[2]
| Juansilvaite | |
|---|---|
 Juansilvaite found in Chile | |
| General | |
| Category | Arsenate, Sulfate |
| Formula (repeating unit) | Na5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2·4H2O |
| Crystal system | Monoclinic |
| Crystal class | Prismatic (2/m) (same H-M symbol) |
| Space group | C2/c |
| Unit cell | a = 18.18, b = 8.63 c = 18.51 [Å], β = 90.39° (approximated) |
| Identification | |
| References | [1][2] |
References
- "Juansilvaite: Juansilvaite mineral information and data". Mindat.org. Retrieved 2016-03-04.
- Kampf, A.R., Nash, B., Dini, M., and Molina Donoso, A.A., 2015. Juansilvaite, IMA 2015-080. CNMNC Newsletter No. 28, December 2015, page ; Mineralogical Magazine 79, 1859–1864
- "Torrecillas mine, Salar Grande, El Tamarugal Province, Tarapacá Region, Chile - Mindat.org". Mindat.org. Retrieved 2016-03-04.
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