Garronite Mineral Data

General Garronite Information

Chemical Formula:

Na2Ca5Al12Si20O64•27(H2O)

Composition:

Molecular Weight = 2,642.23 gm

Sodium 1.74 % Na 2.35 % Na₂O

Calcium 7.58 % Ca 10.61 % CaO

Aluminum 12.25 % Al 23.15 % Al₂O₃

Silicon 21.26 % Si 45.48 % SiO₂

Hydrogen 2.06 % H 18.41 % H₂O

Oxygen 55.10 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca₅Al₁₂Si₂₀O₆₄•27(H₂O)

IMA Status:

Approved IMA 1962

Locality:

Slopes of Glenariff Valley, Garron Plateau, County Antrim, Northern Ireland. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Name Pronunciation:

Garronite + Pronunciation

Garronite Image

Images:

Garronite Siderite

Comments: Translucent white micro crystals of garronite on brown siderite crystals.
Location: Mont Saint Hilaire, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Garronite Crystallography

Axial Ratios:

a:c = 1:1.04203

Cell Dimensions:

a = 9.873, c = 10.288, Z = 0.5; V = 1,002.83 Den(Calc)= 2.19

Crystal System:

Tetragonal - Dipyramidal H-M Symbol (4/m) Space Group: I 4₁/a

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

By Intensity(I/I_o): 2.66(1), 3.14(1), 4.12(1),

Physical Properties of Garronite

Cleavage:

{???} Good, {???} Good

Color:

Colorless, White.

Density:

2.1 - 2.2, Average = 2.15

Diaphaneity:

Transparent to Translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Massive - Fibrous - Distinctly fibrous fine-grained forms.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Garronite

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2317,KPDmeas= 0.236,KC= 0.2319
Ncalc = 1.49 - 1.51

Optical Data:

Biaxial (?), b=1.5-1.515

Calculated Properties of Garronite

Electron Density:

Bulk Density (Electron Density)=2.22 gm/cc
note: Specific Gravity of Garronite =2.19 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Garronite= 2.16 barns/electron
U=PE_Garronite x rElectron Density= 4.80 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Garronite is Not Radioactive

Garronite Classification

Dana Class:

77.01.03.03 (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 Garronite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Garronite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - EUROmin Project
6 - Ecole des Mines de Paris
7 - GeoScienceWorld
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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Garronite

Na2Ca5Al12Si20O64•27(H2O)
Dana No: 77.01.03.03 Strunz No: 09.GC.05
Locality:

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