General Tschernichite Information
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Chemical Formula: |
(Ca,Na)(Si6Al2)O16·4-8(H2O) |
Composition: |
Molecular Weight = 658.39 gm |
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Sodium 0.87 % Na 1.18 % Na2O |
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Calcium 4.57 % Ca 6.39 % CaO |
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Aluminum 8.20 % Al 15.49 % Al2O3 |
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Silicon 25.59 % Si 54.76 % SiO2 |
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Hydrogen 2.45 % H 21.89 % H2O |
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Oxygen 58.32 % O |
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______ ______ |
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100.00 % 99.70 % = TOTAL OXIDE |
Empirical Formula: |
Ca0.75Na0.25Si6Al2O16·8(H2O) |
Environment: |
In vesicles in an olivine basalt, formed by hydrothermal action. Monoclinic polymorph may be a separate species. |
IMA Status: |
Approved IMA 1991 |
Locality: |
Neer Road pit, Goble, Colombia County, Oregon, USA. Link to MinDat.org Location Data. |
Name Origin: |
Named for Rudy Warren Tschernich (1945-), amateur mineralogist specializing in zeolites. |
Synonym: |
IMA1989-037 |
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Tschernichite Image |
Images:
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Tschernichite Crystallography
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Axial Ratios: |
a:c = 1:1.94254 |
Cell Dimensions: |
a = 12.88, c = 25.02, Z = 8; V = 4,150.68 Den(Calc)= 2.11 |
Crystal System: |
Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/mmm |
X Ray Diffraction: |
By Intensity(I/Io): 4.03(1), 11.6(0.32), 2.114(0.16),3.156(0.16), 3.062(0.15), 4.22(0.14), 12.5(0.1), |
Crystal Structure:
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Alberti A , Cruciani G , Galli E , Merlino S , Millini R , Quartieri S , Vezzalini G , Zanardi S , Journal of Physical Chemistry , B106 (2002) p.10277-10284, Crystal structure of tetragonal and monoclinic polytypes of tschernichite,, the natural counterpart of synthetic zeolite beta, Locality: Mt. Adamson, Northern Victoria Land, Antarctica, Sample: large crystal, monoclinic, Note: Ca1 occupancies invented to better represent crystal
View Additional jPOWD Structure files for Tschernichite
[1]
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Physical Properties of Tschernichite
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Cleavage: |
None |
Color: |
Colorless, Milky white. |
Density: |
2.02 |
Diaphaniety: |
Transparent to Translucent |
Fracture: |
Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. |
Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
Habit: |
Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces. |
Hardness: |
4.5 - Between Fluorite and Apatite |
Luminescence: |
Sometimes Fluorescent, Short UV=pale yellow, Long UV=pale yellow. |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Tschernichite
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Gladstone-Dale: |
CI meas= -0.014 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2291,KPDmeas= 0.2394,KC= 0.236 |
Optical Data: |
Uniaxial (-), e=1.483, w=1.484, bire=0.0010. |
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Calculated Properties of Tschernichite
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Electron Density: |
relectron=2.06 gm/cc note: rTschernichite =2.02 gm/cc. |
Fermion Index |
Fermion Index = 0.01229 Boson Index = 0.98771 |
Photoelectric: |
PETschernichite = 1.84 barns/electron U=PETschernichite x relectron= 3.79 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Tschernichite is Not Radioactive |
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Tschernichite Classification
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Dana Class: |
77.1.8.2 (77)Tectosilicate Zeolite group |
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(77.1)true zeolites |
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(77.1.8)Unclassified zeolite species |
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77.1.8.1 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72·30(H2O) P 63/mmc, P 62c-, P 63mc Hex |
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77.1.8.2 Tschernichite (Ca,Na)(Si6Al2)O16·4-8(H2O) P 4/mmm 4/m 2/m 2/m |
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77.1.8.3 Mazzite-Na! Na8Al8Si28O72·30(H2O) P 63/mmc 6/m 2/m 2/m |
Strunz Class: |
VIII/J.26-40 VIII - Silicates |
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VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites |
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VIII/J.26 - Zeolite group, Willhendersonite - Chabazite - Perialite series |
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VIII/J.26-10 Willhendersonite KCaAl3Si3O12·5(H2O) P1 1 |
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VIII/J.26-20 Chabazite-Na! (Na2,K2,Ca,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-25 Chabazite-K! (K2,Ca,Na2,Mg)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-30 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]·12H2O P1 1 |
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VIII/J.26-35 Chabazite-Sr! (Sr,Ca,K2,Na2)[Al2Si4O12]·6(H2O) R 3m 3 2/m |
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VIII/J.26-40 Tschernichite (Ca,Na)(Si6Al2)O16·4-8(H2O) P 4/mmm 4/m 2/m 2/m |
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VIII/J.26-50 Gmelinite-Na (Na2,Ca)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-52 Gmelinite-K! (K,Na,Ca)6(Al7Si17O48)·22(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-54 Gmelinite-Ca! (Ca,Na2)Al2Si4O12·6(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-58 Levyne-Na! (Na2,Ca,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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VIII/J.26-60 Levyne-Ca (Ca,Na2,K2)Al2Si4O12·6(H2O) R 3m 3 2/m |
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VIII/J.26-70 Offretite (K2,Ca,Mg)2.5Al5Si13O36·15(H2O) P 6m2 6 m2 |
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VIII/J.26-80 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-90 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-92 Erionite-K! (K2,Ca,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-94 Erionite-Ca! (Ca,K2,Na2)2[Al4Si14O36]·15(H2O) P 63/mmc 6/m 2/m 2/m |
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VIII/J.26-95 Bellbergite (K,Ba,Sr)2Sr2Ca2(Ca,Na)4Al18Si18O72·30(H2O) P 63/mmc, P 62c-, P 63mc Hex |
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VIII/J.26-100 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m |
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Other Tschernichite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.78,p822-826,1993) OPTIC PROP.(Am.Min.,Vol.78,p822-826,1993) |
See Also: |
Links to other databases for Tschernichite :
1 -Am. Min. Crystal Structure Database
2 -Athena
3 - EUROmin Project
4 -Google Images
5 -Google Scholar
6 -Handbook of Mineralogy (MinSocAm)
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 -École des Mines de Paris
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Tschernichite
(Ca,Na)(Si6Al2)O16·4-8(H2O)
Dana No: 77.1.8.2 Strunz No: VIII/J.26-40
Locality:
Notes:
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