General Amicite Information
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Chemical Formula: |
K2Na2Al4Si4O16·5(H2O) |
Composition: |
Molecular Weight = 690.51 gm |
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Potassium 11.32 % K 13.64 % K2O |
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Sodium 6.66 % Na 8.98 % Na2O |
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Aluminum 15.63 % Al 29.53 % Al2O3 |
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Silicon 16.27 % Si 34.81 % SiO2 |
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Hydrogen 1.46 % H 13.04 % H2O |
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Oxygen 48.66 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
K2Na2Al4Si4O16·5(H2O) |
Environment: |
In veinlets cutting melilite-nephelinite volcanic rocks and pyroclastics (Hegau, Germany); in natrolite veinlets cutting ijolite-urtite pegmatites and apatite-nepheline rocks (Kola Peninsula, Russia). |
IMA Status: |
Approved IMA 1979 |
Locality: |
In the Howenegg quarry, Hegau, Baden-Wurttemberg, Germany. From the Kukisvumchorr apatite deposit, Khibiny massif, Kola Peninsula, Russia. Link to MinDat.org Location Data. |
Name Origin: |
To honor Giovan Battista, Amici (1786-1863), physicist, optician, and inventor of microscope optical elements. |
Synonym: |
ICSD 8523 |
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PDF 33-1273 |
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Amicite Image |
Images:
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Amicite Crystallography
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Axial Ratios: |
a:b:c =0.9811:1:0.9483 |
Cell Dimensions: |
a = 10.226, b = 10.422, c = 9.884, Z = 2; beta = 88.317° V = 1,052.94 Den(Calc)= 2.18 |
Crystal System: |
Monoclinic - SphenoidalH-M Symbol (2) Space Group: I2 |
X Ray Diffraction: |
By Intensity(I/Io): 2.722(1), 4.22(0.9), 3.141(0.8), |
Crystal Structure:
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Alberti A , Vezzalini G , Acta Crystallographica, Section B , 35 (1979) p.2866-2869, The crystal structure of amicite, a zeolite, Locality: basaltic rock at Howenegg in Hegau, southern West Germany
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Physical Properties of Amicite
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Cleavage: |
None |
Color: |
Colorless. |
Density: |
2.06 |
Diaphaniety: |
Transparent |
Hardness: |
5-5.5 - Apatite-Knife Blade |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Amicite
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Gladstone-Dale: |
CI meas= -0.091 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -0.031 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2284,KPDmeas= 0.2417,KC= 0.2217 |
Optical Data: |
Biaxial (?), b=1.498 |
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Calculated Properties of Amicite
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Electron Density: |
relectron=2.18 gm/cc note: rAmicite =2.18 gm/cc. |
Fermion Index |
Fermion Index = 0.00784 Boson Index = 0.99216 |
Photoelectric: |
PEAmicite = 2.33 barns/electron U=PEAmicite x relectron= 5.10 barns/cc. |
Radioactivity: |
GRapi = 163.73 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Amicite - barely detectable
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Amicite Classification
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Dana Class: |
77.1.3.2 (77)Tectosilicate Zeolite group |
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(77.1)true zeolites |
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(77.1.3)Gismondine and related species |
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77.1.3.1 Gismondine Ca2Al4Si4O16·9(H2O) P 21/c 2/m |
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77.1.3.2 Amicite K2Na2Al4Si4O16·5(H2O) I2 2 |
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77.1.3.3 Garronite Na2Ca5Al12Si20O64·27(H2O) I 41/a 4/m |
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77.1.3.4 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn21 mm2 |
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77.1.3.5 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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77.1.3.6 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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77.1.3.6a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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77.1.3.6b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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77.1.3.8 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m |
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77.1.3.9 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m |
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77.1.3.9a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m |
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77.1.3.9b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m |
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77.1.3.10 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 63/mmc 6/m 2/m 2/m |
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77.1.3.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m |
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77.1.3.12 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2 |
Strunz Class: |
VIII/J.25-10 VIII - Silicates |
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VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites |
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VIII/J.25 - Zeolite group, Amicite - Phillipsite - Yugawaralite series |
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VIII/J.25-10 Amicite K2Na2Al4Si4O16·5(H2O) I2 2 |
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VIII/J.25-20 Gismondine Ca2Al4Si4O16·9(H2O) P 21/c 2/m |
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VIII/J.25-30 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn21 mm2 |
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VIII/J.25-40 Garronite Na2Ca5Al12Si20O64·27(H2O) I 41/a 4/m |
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VIII/J.25-50 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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VIII/J.25-55 Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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VIII/J.25-60 Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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VIII/J.25-70 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 21/m 2/m |
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VIII/J.25-75 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2 |
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VIII/J.25-80 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m |
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VIII/J.25-90 Yugawaralite CaAl2Si6O16·4(H2O) Pc m |
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Other Amicite Information
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References: |
NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990) |
See Also: |
Links to other databases for Amicite :
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 - WWW-MINCRYST
14 -École des Mines de Paris
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Amicite
K2Na2Al4Si4O16·5(H2O)
Dana No: 77.1.3.2 Strunz No: VIII/J.25-10
Locality:
Notes:
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