Erionite-Ca Mineral Data

General Erionite-Ca Information

Chemical Formula:

(Ca,K2,Na2)2[Al4Si14O36]•15(H2O)

Composition:

Molecular Weight = 2,904.81 gm

Potassium 2.07 % K 2.50 % K₂O

Sodium 0.75 % Na 1.01 % Na₂O

Calcium 3.15 % Ca 4.40 % CaO

Magnesium 0.72 % Mg 1.19 % MgO

Aluminum 8.20 % Al 15.50 % Al₂O₃

Silicon 26.01 % Si 55.64 % SiO₂

Hydrogen 2.18 % H 19.44 % H₂O

Oxygen 56.92 % O

______ ______

100.00 % 99.69 % = TOTAL OXIDE

Empirical Formula:

Ca_2.28K_1.54Na_0.95Mg_0.86Al_8.83Si_26.9O₇₂•31.35(H₂O)

Environment:

Occurs in volcanic and sedimentary rocks. Found in amygdules in altered basalt.

IMA Status:

Approved IMA 1967 (Dana # Added)

Locality:

Maze, Niigata Prefecture, Japan. Link to MinDat.org Location Data.

Name Origin:

From the Greek for wool, in allusion to its white, fibrous, wool-like appearance. The Ca-dominant member of the erionite series.

Name Pronunciation:

Erionite-Ca

Erionite-Ca Image

Images:

Erionite-Ca

Comments: Radiating group of colorless acicular hexagonal prisms of erionite-Ca.
Location: Moeraki, Otago, South Island, New Zealand. Scale: See Image.
© Rruff Database

Erionite-Ca Crystallography

Axial Ratios:

a:c = 1:1.13185

Cell Dimensions:

a = 13.333, c = 15.091, Z = 1; V = 2,323.30 Den(Calc)= 2.08

Crystal System:

Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6₃/mmc

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

By Intensity(I/I_o): 11.41(1), 6.61(0.73), 4.322(0.67),

Physical Properties of Erionite-Ca

Cleavage:

{010} Distinct

Color:

White, Green, Gray, Orange.

Density:

2.09 - 2.13, Average = 2.11

Diaphaneity:

Transparent to translucent

Fracture:

Splintery - Thin, elongated fractures produced by intersecting good cleavages or partings (e.g. hornblende).

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3.5-4 - Copper Penny-Fluorite

Luster:

Vitreous - Silky

Magnetism:

Nonmagnetic

Streak:

white

Optical Properties of Erionite-Ca

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.036 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2239,KPDmeas= 0.2207,KC= 0.2324
Ncalc = 1.48 - 1.49

Optical Data:

Uniaxial (+), w=1.4711, e=1.474, bire=0.0191.

Calculated Properties of Erionite-Ca

Electron Density:

Bulk Density (Electron Density)=2.11 gm/cc
note: Specific Gravity of Erionite-Ca =2.08 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Erionite-Ca= 1.90 barns/electron
U=PE_Erionite-Ca x r_electron= 4.01 barns/cc.

Radioactivity:

GRapi = 30.40 (Gamma Ray American Petroleum Institute Units)
Concentration of Erionite-Ca per GRapi unit = 3.29 (%)

Estimated Radioactivity from Erionite-Ca - barely detectable

Erionite-Ca Classification

Dana Class:

77.01.02.05b (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.02)Chabazite and related species

77.01.02.01 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1

77.01.02.01a Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01b Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.01c Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m

77.01.02.02 Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m

77.01.02.03 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1

77.01.02.04 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6m2 6 m2

77.01.02.05 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05a Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.05b Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06a Gmelinite-Ca! (Ca,Na2)Al2Si4O12•6(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.06b Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.02.07 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07a Faujasite-Ca! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.07b Faujasite-Mg! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m

77.01.02.08 Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.08a Levyne-Na! (Na2,Ca,K2)Al2Si4O12•6(H2O) R 3m 3 2/m

77.01.02.09 Tschortnerite! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m

Strunz Class:

09.GD.20 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GD -Chains of 6-membered rings � tabular zeolites

09.GD.20 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72•30(H2O) P 6₃/mmc, P 6₂c-, P 6₃mc Hex

09.GD.20 Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

09.GD.20 Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

09.GD.20 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 6₃/mmc 6/m 2/m 2/m

Other Erionite-Ca Information

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Erionite-Ca :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Erionite-Ca

(Ca,K2,Na2)2[Al4Si14O36]•15(H2O)
Dana No: 77.01.02.05b Strunz No: 09.GD.20
Locality:

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