Juansilvaite

Juansilvaite
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)
H-M symbol: (2/m)
Space group C2/c
Unit cell a = 18.18, b = 8.63
c = 18.51 [Å], β = 90.39° (approximated)
Identification
References [1][2]

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]

References

  1. 1 2 "Juansilvaite: Juansilvaite mineral information and data". Mindat.org. Retrieved 2016-03-04.
  2. 1 2 3 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
  3. "Torrecillas mine, Salar Grande, El Tamarugal Province, Tarapacá Region, Chile - Mindat.org". Mindat.org. Retrieved 2016-03-04.


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