Wairakite

Zeolite mineral From Wikipedia, the free encyclopedia

Wairakite

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 Czechoslovakian mineralogist Alfred Steiner in 1955.[4][5] The first finds were in hydrothermally altered rhyolitic tuffs, ignimbrites and volcaniclastic rocks.[5] 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.[6]

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Wairakite
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Wairakite from Azerbaijan
General
CategoryTectosilicate minerals, zeolite group
FormulaCa8(Al16Si32O96)•16H2O
IMA symbolWrk[1]
Strunz classification9.GB.05
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H-M symbol)
Space groupI2/a
Unit cella = 13.69 Å, b = 13.64 Å
c = 13.56 Å; β = 90.51°; Z = 8
Identification
Colorcolorless to white
Lustervitreous, dull
Streakwhite
Diaphaneitytransparent, translucent
References[2][3]
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References

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