Wairakite

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Wairakite
General
Category Zeolite minerals
Formula
(repeating unit)
Ca8(Al16Si32O96)•16H2O
Strunz classification 9.GB.05
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group I2/a
Unit cell a = 13.69 Å, b = 13.64 Å
c = 13.56 Å; β = 90.51°; Z = 8
Identification
Color colorless to white
Luster vitreous, dull
Streak white
Diaphaneity transparent, translucent
References [1][2]

Wairakite is a zeolite mineral with an analcime structure but containing a calcium ion. The chemical composition is Ca8(Al16Si32O96)•16H2O. It is named for the location of its discovery in Wairakei, North Island, New Zealand, by Alfred Steiner in 1955.[3][4] The mineral has since been found in metamorphic rocks and in geothermal areas. It was most likely first successfully synthesized in a laboratory in 1970.[5]

References[edit]

  1. ^ Mindat
  2. ^ Mineralienatlas
  3. ^ Szostak, Rosemarie (1992), Handbook of molecular sieves, Springer, p. 482, ISBN 0-442-31899-5 
  4. ^ Steiner, Alfred (1955), "Wairakite, the calcium analogue of analcime, a new zeolite mineral" (PDF), Mineralogy Magazine, 30: 691–698, retrieved 2011-09-08 
  5. ^ Liou, J. G., "Synthesis and stability relations of wairakite, CaAl2 Si4 O12·2H2O", Contributions to Mineralogy and Petrology, 27 (4): 259–282, Bibcode:1970CoMP...27..259L, doi:10.1007/BF00389814