Wairakite Mineral Data
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 % Al2 O3
Silicon 25.86 % Si 55.33 % SiO2
Hydrogen 0.93 % H 8.29 % H2 O
Oxygen 51.56 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
CaAl2 Si4 O12 •2(H2 O)
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.
Name Pronunciation:
Wairakite + Pronunciation
Synonym:
ICSD 100553
PDF 42-1451
Wairakite Image
Images:
Images:
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 - Prismatic H-M Symbol (2/m) Space Group: I2/a
X Ray Diffraction:
By Intensity(I/Io ): 3.41(1), 5.57(0.9), 2.9(0.8),
Physical Properties of Wairakite
Cleavage:
{100} Distinct
Color:
Colorless, White.
Density:
2.26
Diaphaneity:
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 Ncalc = 1.49 - 1.5
Optical Data:
Biaxial (+/-), a=1.498, g=1.502, bire=0.0040, 2V(Meas)=70-105.
Calculated Properties of Wairakite
Electron Density:
Bulk Density (Electron Density)=2.29 gm/cc note: Specific Gravity of Wairakite =2.28 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEWairakite = 2.50 barns/electronU=PEWairakite x r Electron Density= 5.72 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Wairakite is Not Radioactive
Wairakite Classification
Dana Class:
77.01.01.03 (77) Tectosilicate Zeolite group
(77.01) true zeolites
(77.01.01) Analcime and related species
77.01.01.01 Analcime NaAlSi2O6•(H2O) P1 1
77.01.01.02 Pollucite (Cs,Na)2Al2Si4O12•(H2O) I a3d 4/m 3 2/m
77.01.01.03 Wairakite CaAl2Si4O12•2(H2O) I2/a 2/m
77.01.01.04 Laumontite CaAl2Si4O12•4(H2O) C 2/m 2/m
77.01.01.05 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 21 3 2 3
Strunz Class:
09.GB.05 09 - SILICATES (Germanates)
09.G - Tektosilicates with Zeolitic H2O
09.GB -Chains of single connected 4-membered rings
09.GB.05 Ammonioleucite (NH4,K)AlSi2O6 I 41 /a 4/m
09.GB.05 Analcime NaAlSi2O6•(H2O) P1 1
09.GB.05 Hsianghualite Ca3Li2Be3(SiO4)3F2 I 21 3 2 3
09.GB.05 Lithosite K6Al4Si8O25•(H2O) P 21 (pseudo ORTH) 2
09.GB.05 Leucite KAlSi2O6 I 41 /a 4/m
09.GB.05 Pollucite (Cs,Na)2Al2Si4O12•(H2O) I a3d 4/m 3 2/m
09.GB.05 Wairakite CaAl2Si4O12•2(H2O) I2/a 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)
See Also:
Links to other databases for Wairakite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST
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Wairakite
CaAl2Si4O12•2(H2O)
Dana No: 77.01.01.03 Strunz No: 09.GB.05
Locality:
Notes:
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