Willhendersonite Mineral Data

General Willhendersonite Information

Chemical Formula:

KCaAl3Si3O12•5(H2O)

Composition:

Molecular Weight = 526.45 gm

Potassium 7.43 % K 8.95 % K₂O

Calcium 7.61 % Ca 10.65 % CaO

Aluminum 15.38 % Al 29.05 % Al₂O₃

Silicon 16.00 % Si 34.24 % SiO₂

Hydrogen 1.91 % H 17.11 % H₂O

Oxygen 51.67 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

KCaAl₃Si₃O₁₂•5(H₂O)

IMA Status:

Approved IMA 1984

Locality:

San Venanzo quarry, Terni, Umbria, Italy. Link to MinDat.org Location Data.

Name Origin:

Named after William A. Henderson, of Stamford, Connecticut, U.S.A., who noted this as an unusual mineral and provided it for study.

Name Pronunciation:

Willhendersonite + Pronunciation

Synonym:

ICSD 30873

PDF 35-643

Willhendersonite Image

Images:

Willhendersonite

Comments: Colorless tabular willhendersonite crystals forming a spherical aggregate.
Location: San Venzano Quarry, Terni, Umbria, central Italy. Scale: See Image.
© Rruff Database

Willhendersonite Crystallography

Axial Ratios:

a:b:c =0.9989:1:1.0308

Cell Dimensions:

a = 9.206, b = 9.216, c = 9.5, Z = 2; alpha = 92.34°, beta = 92.7°, gamma = 90.12° V = 804.44 Den(Calc)= 2.17

Crystal System:

Triclinic - Pinacoidal H-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 9.16(1), 2.907(0.6), 2.804(0.5),

Physical Properties of Willhendersonite

Cleavage:

{100} Perfect, {010} Perfect, {001} Perfect

Color:

Colorless.

Density:

2.18

Diaphaneity:

Transparent

Hardness:

3 - Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Willhendersonite

Gladstone-Dale:

CI meas= -0.022 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.026 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2355,KPDmeas= 0.2344,KC= 0.2294
Ncalc = 1.5

Optical Data:

Biaxial (?), a=1.505, b=1.511, g=1.517, bire=0.0120, 2V(Calc)=88, 2V(Meas)=87.

Calculated Properties of Willhendersonite

Electron Density:

Bulk Density (Electron Density)=2.20 gm/cc
note: Specific Gravity of Willhendersonite =2.18 gm/cc.

Fermion Index:

Fermion Index = 0.007836773
Boson Index = 0.992163227

Photoelectric:

PE_{Willhendersonite}= 2.75 barns/electron
U=PE_{Willhendersonite} x r_electron= 6.07 barns/cc.

Radioactivity:

GRapi = 108.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Willhendersonite per GRapi unit = 0.92 (%)

Estimated Radioactivity from Willhendersonite - barely detectable

Willhendersonite Classification

Dana Class:

77.01.02.03 (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.10 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GD -Chains of 6-membered rings ï¿½ tabular zeolites

09.GD.10 Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1

09.GD.10 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Herschelite? (Na,Ca,K)AlSi2O6•3(H2O) R 3m 3 2/m

09.GD.10 Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3m 3 2/m

09.GD.10 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1

Other Willhendersonite 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 Willhendersonite :
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

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Willhendersonite

KCaAl3Si3O12•5(H2O)
Dana No: 77.01.02.03 Strunz No: 09.GD.10
Locality:

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