Amicite Mineral Data

Amicite Mineral Data +

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General Amicite Information

Chemical Formula:

K2Na2Al4Si4O16·5(H2O)

Composition:

Molecular Weight = 690.51 gm

Potassium 11.32 % K 13.64 % K₂O

Sodium 6.66 % Na 8.98 % Na₂O

Aluminum 15.63 % Al 29.53 % Al₂O₃

Silicon 16.27 % Si 34.81 % SiO₂

Hydrogen 1.46 % H 13.04 % H₂O

Oxygen 48.66 % O

______ ______

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

PDF 33-1273

Amicite Image

Images:

Amicite

Comments: White amicite crystals in massive amicite.
Location: Howenegg, Hegau, Baden-Wurttemberg, Germany. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Amicite Crystallography

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

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

By Intensity(I/I_o): 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

Physical Properties of Amicite

Cleavage:

None

Color:

Colorless.

Density:

2.06

Diaphaniety:

Transparent

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Amicite

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

Calculated Properties of Amicite

Electron Density:

r_electron=2.18 gm/cc
note: r_Amicite=2.18 gm/cc.

Fermion Index

Fermion Index = 0.00784
Boson Index = 0.99216

Photoelectric:

PE_Amicite= 2.33 barns/electron
U=PE_Amicite x r_electron= 5.10 barns/cc.

Radioactivity:

GRapi = 163.73 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Amicite - barely detectable

Amicite Classification

Dana Class:

77.1.3.2 (77)Tectosilicate Zeolite group

(77.1)true zeolites

(77.1.3)Gismondine and related species

77.1.3.1 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

77.1.3.2 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

77.1.3.3 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

77.1.3.4 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

77.1.3.5 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.6b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

77.1.3.8 Perlialite K8Tl4Al12Si24O72·20(H2O) P 6/mmm 6/m 2/m 2/m

77.1.3.9 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90·45(H2O) Im3m 4/m 3 2/m

77.1.3.9b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]·34(H2O) Im3m 4/m 3 2/m

77.1.3.10 Mazzite K2CaMg2(Al,Si)36O72·28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.1.3.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

77.1.3.12 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

Strunz Class:

VIII/J.25-10 VIII - Silicates

VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites

VIII/J.25 - Zeolite group, Amicite - Phillipsite - Yugawaralite series

VIII/J.25-10 Amicite K2Na2Al4Si4O16·5(H2O) I2 2

VIII/J.25-20 Gismondine Ca2Al4Si4O16·9(H2O) P 2₁/c 2/m

VIII/J.25-30 Gobbinsite (Na2,Ca)2K2Al6Si10O32·12(H2O) P mn2₁ mm2

VIII/J.25-40 Garronite Na2Ca5Al12Si20O64·27(H2O) I 4₁/a 4/m

VIII/J.25-50 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-55 Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-60 Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-70 Harmotome (Ba,Na,K)1-2(Si,Al)8O16·6(H2O) P 2₁/m 2/m

VIII/J.25-75 Montesommaite (K,Na)9Al9Si23O64·10(H2O) F dd2 mm2

VIII/J.25-80 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64·23(H2O) I mmm 2/m 2/m 2/m

VIII/J.25-90 Yugawaralite CaAl2Si6O16·4(H2O) Pc m

Other Amicite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Amicite

K2Na2Al4Si4O16·5(H2O)
Dana No: 77.1.3.2 Strunz No: VIII/J.25-10
Locality:

Notes: