[New Updates] [Gallery 1] [Gallery 2] [Gallery 3] [Rock Shop Gallery] Serving the mineral collector and educator community since 1970 Over 900,000 mineral specimens in stock New minerals acquired weekly - Wright's Rock Shop General Herschelite Information(Na,Ca,K)AlSi2O6•3(H2O) |
Molecular Weight = 261.30 gm |
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Potassium 2.99 % K 3.60 % K2O |
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Sodium 7.04 % Na 9.49 % Na2O |
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Calcium 0.77 % Ca 1.07 % CaO |
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Aluminum 11.36 % Al 21.46 % Al2O3 |
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Silicon 20.42 % Si 43.69 % SiO2 |
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Hydrogen 2.31 % H 20.68 % H2O |
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Oxygen 55.11 % O |
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100.00 % 100.00 % = TOTAL OXIDE |
Na0.8K0.2Ca0.05Al1.1Si1.9O6•3(H2O) |
In cavities in basalts. Species name changed to chabazite-Na by the IMA Commission on zeolites. |
Discredited IMA 1997 - Valid Species (Pre-IMA) 1825 |
From Aci Castello and nearby on the flanks of Mt. Etna, Sicily. Link to MinDat.org Location Data. |
Named in 1825 for John Frederick William Herschel (1792-1871), British astronomer. |
Herschelite + Pronunciation |
Discredited IMA 1997 |
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Herschelite Crystallographya:c = 1:1.09442 |
a = 13.799, c = 15.102, Z = 12; V = 2,490.35 Den(Calc)= 2.09 |
Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m |
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{1011} Distinct |
Colorless, White. |
2.08 - 2.16, Average = 2.12 |
Transparent to Translucent |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Platy - Sheet forms (e.g. micas). |
4-5 - Fluorite-Apatite |
Vitreous (Glassy) |
white |
| Optical Properties of HerscheliteCI 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 Uniaxial (-), e=1.471-1.479, w=1.474-1.481, bire=0.0020-0.0030. |
| Calculated Properties of HerscheliteBulk Density (Electron Density)=2.12 gm/cc |
note: Specific Gravity of Herschelite =2.09 gm/cc. Fermion Index = 0.0098189704 |
Boson Index = 0.9901810296 PEHerschelite = 1.66 barns/electron |
U=PEHerschelite x relectron= 3.52 barns/cc. |
GRapi = 43.80 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Herschelite | Herschelite Classification77.01.02.02 (77)Tectosilicate Zeolite group |
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(77.01)true zeolites |
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(77.01.02)Chabazite and related species |
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09.GD.10 09 - SILICATES (Germanates) |
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09.G - Tektosilicates with Zeolitic H2O |
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09.GD -Chains of 6-membered rings – tabular zeolites |
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| Other Herschelite InformationNAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2) |
Links to other databases for Herschelite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - Google Images 6 - Google Scholar 7 - Handbook of Mineralogy (UofA) 8 - MinDAT 9 - MinMax(Deutsch) 10 - MinMax(English) 11 - Mineralienatlas (Deutsch) 12 - QUT Mineral Atlas 13 - Ruff.Info Search for Herschelite using: Visit our Advertisers for Herschelite : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Desert Winds Gems and Minerals Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Herschelite Mineral Data : Ask about Herschelite here : Print or Cut-and-Paste your Herschelite Specimen Label here :
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