Mineralogy Database

Herschelite Mineral Data

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General Herschelite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca,K)AlSi2O6•3(H2O)
Help on Composition: Composition: Molecular Weight = 261.30 gm
   Potassium   2.99 %  K     3.60 % K2O
   Sodium      7.04 %  Na    9.49 % Na2O
   Calcium     0.77 %  Ca    1.07 % CaO
   Aluminum   11.36 %  Al   21.46 % Al2O3
   Silicon    20.42 %  Si   43.69 % SiO2
   Hydrogen    2.31 %  H    20.68 % H2O
   Oxygen     55.11 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.8K0.2Ca0.05Al1.1Si1.9O6•3(H2O)
Help on Environment: Environment: In cavities in basalts. Species name changed to chabazite-Na by the IMA Commission on zeolites.
Help on IMA Status: IMA Status: Discredited IMA 1997 - Valid Species (Pre-IMA) 1825
Help on Locality: Locality: From Aci Castello and nearby on the flanks of Mt. Etna, Sicily. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named in 1825 for John Frederick William Herschel (1792-1871), British astronomer.
Help on Name Pronunciation: Name Pronunciation: Herschelite + Pronunciation Say HERSCHELITE
Help on Synonym: Synonym: Discredited IMA 1997
 

Herschelite Image

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  Herschelite   Chabazite-Na

Comments: Rounded transparent crystals of chabazite-Na (herschelite).
Location: Horseshoe Dam, Maricopa County, Arizona, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Herschelite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.09442
Help on Cell Dimensions: Cell Dimensions: a = 13.799, c = 15.102, Z = 12; V = 2,490.35 Den(Calc)= 2.09
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.93(1), 4.32(0.65), 6.36(0.5),5.03(0.4), 2.987(0.3), 3.88(0.25), 6.89(0.2),
 

Physical Properties of Herschelite

Help on Cleavage: Cleavage: {1011} Distinct
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.08 - 2.16, Average = 2.12
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Herschelite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.036 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2279,KPDmeas= 0.2246,KC= 0.233
Ncalc = 1.48 - 1.5
Help on Optical Data: Optical Data: Uniaxial (-), e=1.471-1.479, w=1.474-1.481, bire=0.0020-0.0030.
 

Calculated Properties of Herschelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.12 gm/cc
note: Specific Gravity of Herschelite =2.09 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0098189704
Boson Index = 0.9901810296
Help on Photoelectric: Photoelectric: PEHerschelite = 1.66 barns/electron
U=PEHerschelite x relectron= 3.52 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 43.80 (Gamma Ray American Petroleum Institute Units)
Concentration of Herschelite per GRapi unit = 2.28 (%)

Estimated Radioactivity from Herschelite - barely detectable

 

Herschelite Classification

Help on  Dana Class: Dana Class: 77.01.02.02 (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
Help on  Strunz Class: Strunz Class: 09.GD.10 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GD -Chains of 6-membered rings � 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 Herschelite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Herschelite :
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 (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Print or Cut-and-Paste your Herschelite Specimen Label here :

Herschelite

(Na,Ca,K)AlSi2O6•3(H2O)
Dana No: 77.01.02.02 Strunz No: 09.GD.10
Locality:

 

Notes:

 

 
   
 


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