Amicite Mineral Data

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.

Name Pronunciation:

Amicite

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 - Sphenoidal H-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),

Physical Properties of Amicite

Cleavage:

None

Color:

Colorless.

Density:

2.06

Diaphaneity:

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
Ncalc = 1.46 - 1.48

Optical Data:

Biaxial (?), b=1.498

Calculated Properties of Amicite

Electron Density:

Bulk Density (Electron Density)=2.18 gm/cc
note: Specific Gravity of Amicite =2.18 gm/cc.

Fermion Index:

Fermion Index = 0.0078471452
Boson Index = 0.9921528548

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)
Concentration of Amicite per GRapi unit = 0.61 (%)

Estimated Radioactivity from Amicite - barely detectable

Amicite Classification

Dana Class:

77.01.03.02 (77)Tectosilicate Zeolite group

(77.01)true zeolites

(77.01.03)Gismondine and related species

77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 2₁/c 2/m

77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2

77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 4₁/a 4/m

77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn2₁ mm2

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

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

77.01.03.06a Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.06b Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 2₁/m 2/m

77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m

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

77.01.03.09a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m

77.01.03.09b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 4/m 3 2/m

77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 6₃/mmc 6/m 2/m 2/m

77.01.03.10a Mazzite-Na! Na8Al8Si28O72•30H2O P 6₃/mmc 6/m 2/m 2/m

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

77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2

Strunz Class:

09.GC.05 09 - SILICATES (Germanates)

09.G - Tektosilicates with Zeolitic H2O

09.GC -Chains of doubly-connected 4-membered rings

09.GC.05 Amicite K2Na2Al4Si4O16•5(H2O) I2 2

09.GC.05 Garronite Na2Ca5Al12Si20O64•27(H2O) I 4₁/a 4/m

09.GC.05 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn2₁ mm2

09.GC.05 Gismondine Ca2Al4Si4O16•9(H2O) P 2₁/c 2/m

Other Amicite Information

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 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Amicite

K2Na2Al4Si4O16•5(H2O)
Dana No: 77.01.03.02 Strunz No: 09.GC.05
Locality:

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