Garronite Mineral Data
General Garronite Information
Chemical Formula:
Na2Ca5Al12Si20O64•27(H2O)
Composition:
Molecular Weight = 2,642.23 gm
Sodium 1.74 % Na 2.35 % Na2 O
Calcium 7.58 % Ca 10.61 % CaO
Aluminum 12.25 % Al 23.15 % Al2 O3
Silicon 21.26 % Si 45.48 % SiO2
Hydrogen 2.06 % H 18.41 % H2 O
Oxygen 55.10 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na2 Ca5 Al12 Si20 O64 •27(H2 O)
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEGarronite = 2.16 barns/electronU=PEGarronite x r Electron 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) Im3 m 4/m 3 2/m
77.01.03.09a Paulingite-Na ! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3 m 4/m 3 2/m
77.01.03.09b Paulingite-Ca ! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3 m 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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Print or Cut-and-Paste your Garronite Specimen Label here :
Garronite
Na2Ca5Al12Si20O64•27(H2O)
Dana No: 77.01.03.03 Strunz No: 09.GC.05
Locality:
Notes:
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