Wairakite Mineral Data

Wairakite Mineral Data +

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General Wairakite Information

Chemical Formula:

CaAl2Si4O12·2(H2O)

Composition:

Molecular Weight = 434.41 gm

Calcium 9.23 % Ca 12.91 % CaO

Aluminum 12.42 % Al 23.47 % Al₂O₃

Silicon 25.86 % Si 55.33 % SiO₂

Hydrogen 0.93 % H 8.29 % H₂O

Oxygen 51.56 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaAl₂Si₄O₁₂·2(H₂O)

Environment:

Possibly forms a continuous solid-solution series with analcime.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

Wairakei, Taupo Volcanic Zone, New Zealand. Link to MinDat.org Location Data.

Name Origin:

Named for the loclity.

Synonym:

ICSD 100553

PDF 42-1451

Wairakite Image

Images:

Wairakite Dmisteinbergite

Comments: Pearly platy crystalline dmisteinbergite with dull white wairakite on matrix.
Location: Kurumazawa, Katashina, Gumma, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Wairakite

Comments: White nearly opaque crystalline massive wairakite, with a few crystals faces present.
Location: Tohi Mine, Shizuoka, Japan. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wairakite Crystallography

Axial Ratios:

a:b:c =1.0035:1:0.9939

Cell Dimensions:

a = 13.692, b = 13.643, c = 13.56, Z = 8; beta = 90.5° V = 2,532.91 Den(Calc)= 2.28

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.41(1), 5.57(0.9), 2.9(0.8),

Crystal Structure:

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Takeuchi Y , Mazzi F , Haga N , Galli E , American Mineralogist , 64 (1979) p.993-1001, The crystal structure of wairakite

View Additional jPOWD Structure files for Wairakite
[1] [2] [3] [4] [5]

Physical Properties of Wairakite

Cleavage:

[100] Distinct

Color:

Colorless, White.

Density:

2.26

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Wairakite

Gladstone-Dale:

CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2193,KPDmeas= 0.2212,KC= 0.219

Optical Data:

Biaxial (+/-), a=1.498, g=1.502, bire=0.0040, 2V(Meas)=70-105.

Calculated Properties of Wairakite

Electron Density:

r_electron=2.29 gm/cc
note: r_Wairakite=2.28 gm/cc.

Fermion Index

Fermion Index = 0.01245
Boson Index = 0.98755

Photoelectric:

PE_Wairakite= 2.50 barns/electron
U=PE_Wairakite x r_electron= 5.72 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wairakite is Not Radioactive

Wairakite Classification

Dana Class:

77.1.1.3 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.1)Analcime and related species

77.1.1.1 Analcime NaAlSi2O6·(H2O) P1 1

77.1.1.2 Pollucite (Cs,Na)2Al2Si4O12·(H2O) I a3d 4/m 3 2/m

77.1.1.3 Wairakite CaAl2Si4O12·2(H2O) I2/a 2/m

77.1.1.4 Laumontite CaAl2Si4O12·4(H2O) C 2/m 2/m

77.1.1.5 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 2₁3 2 3

Strunz Class:

VIII/J.27-30 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.27 - Zeolite group, Analcime - Paulingite series

VIII/J.27-10 Analcime NaAlSi2O6·(H2O) P1 1

VIII/J.27-20 Pollucite (Cs,Na)2Al2Si4O12·(H2O) I a3d 4/m 3 2/m

VIII/J.27-30 Wairakite CaAl2Si4O12·2(H2O) I2/a 2/m

VIII/J.27-40 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-44 Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-46 Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]·32(H2O) F d3m 4/m 3 2/m

VIII/J.27-50 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

VIII/J.27-54 Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m

Other Wairakite Information

References:

NAME( CanMin, v 35, p 1591) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Wairakite

CaAl2Si4O12·2(H2O)
Dana No: 77.1.1.3 Strunz No: VIII/J.27-30
Locality:

Notes: