Faujasite-Mg Mineral Data
General Faujasite-Mg Information
Chemical Formula:
(Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O)
Composition:
Molecular Weight = 2,099.99 gm
Sodium 1.15 % Na 1.55 % Na2 O
Calcium 0.67 % Ca 0.93 % CaO
Magnesium 2.43 % Mg 4.03 % MgO
Aluminum 8.99 % Al 16.99 % Al2 O3
Silicon 22.74 % Si 48.64 % SiO2
Hydrogen 3.07 % H 27.45 % H2 O
Oxygen 60.95 % O
______ ______
100.00 % 99.60 % = TOTAL OXIDE
Empirical Formula:
3.5(Mg0.6 )3.5(Na0.3 )3.5(Ca0.1 )Al7 Si17 O48 •32(H2 O)
Environment:
Usually occurs in basaltic volcanics, metapyroxenite, also with augite in limburgite.
IMA Status:
Approved IMA 1998 (Dana # Added)
Locality:
Sasback in the Kaiserstuhl, Baden, Germany. Link to MinDat.org Location Data.
Name Origin:
Named after Barthelemy Faujas de Saint Fond (1741-1819), French geologist and writer on the origin of volcanoes. The Mg-dominant member of the faujasite series.
Name Pronunciation:
Faujasite-Mg + Pronunciation
Faujasite-Mg Image
Images:
Faujasite-Mg
Comments: Colorless octahedra of faujasite-Mg in basalt vesicles.
Location: Limburg Quarries, Sasbach, Kaiserstuhl, Baden-Wurttemberg, Germany.
Scale: See Image.
© Rruff Database
Faujasite-Mg Crystallography
Cell Dimensions:
a = 24.7, Z = 8; V = 15,069.22 Den(Calc)= 1.85
Crystal System:
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: F d3m
X Ray Diffraction:
By Intensity(I/Io ): 3.76(1), 5.66(1), 14.3(1),
Physical Properties of Faujasite-Mg
Cleavage:
{111} Perfect, {111} Perfect, {111} Perfect
Color:
Colorless, White, Pale brown.
Density:
1.923 - 1.94, Average = 1.93
Diaphaneity:
Transparent to translucent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Hardness:
5 - Apatite
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Faujasite-Mg
Gladstone-Dale:
CI meas = -0.013 (Superior) - where the CI = (1-KPDmeas /KC ) CI calc = -0.058 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2568,KPDmeas = 0.2459,KC = 0.2427 Ncalc = 1.45 - 1.47
Optical Data:
Isotropic, n=1.47-1.48.
Calculated Properties of Faujasite-Mg
Electron Density:
Bulk Density (Electron Density)=1.98 gm/cc note: Specific Gravity of Faujasite-Mg =1.93 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEFaujasite-Mg = 1.36 barns/electronU=PEFaujasite-Mg x r Electron Density= 2.69 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Faujasite-Mg is Not Radioactive
Faujasite-Mg Classification
Dana Class:
77.01.02.07b (77) Tectosilicate Zeolite group
(77.01) true zeolites
(77.01.02) Chabazite and related species
77.01.02.01 Chabazite-Ca (Ca0.5,Na,K)4[Al4Si8O24]•12H2O P1 1
77.01.02.01a Chabazite-Na ! (Na2,K2,Ca,Mg)[Al2Si4O12]•6(H2O) R 3 m 3 2/m
77.01.02.01b Chabazite-K ! (K2,Ca,Na2,Mg)[Al2Si4O12]•6(H2O) R 3 m 3 2/m
77.01.02.01c Chabazite-Sr ! (Sr,Ca,K2,Na2)[Al2Si4O12]•6(H2O) R 3 m 3 2/m
77.01.02.02 Herschelite ? (Na,Ca,K)AlSi2O6•3(H2O) R 3 m 3 2/m
77.01.02.03 Willhendersonite KCaAl3Si3O12•5(H2O) P1 1
77.01.02.04 Offretite (K2,Ca,Mg)2.5Al5Si13O36•15(H2O) P 6 m2 6 m2
77.01.02.05 Erionite-Na (Na2,K2,Ca)2[Al4Si14O36]•15(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.05a Erionite-K ! (K2,Ca,Na2)2[Al4Si14O36]•15(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.05b Erionite-Ca ! (Ca,K2,Na2)2[Al4Si14O36]•15(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.06 Gmelinite-Na (Na2,Ca)Al2Si4O12•6(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.06a Gmelinite-Ca ! (Ca,Na2)Al2Si4O12•6(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.06b Gmelinite-K ! (K,Na,Ca)6(Al7Si17O48)•22(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.02.07 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
77.01.02.07a Faujasite-Ca ! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
77.01.02.07b Faujasite-Mg ! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
77.01.02.08 Levyne-Ca (Ca,Na2,K2)Al2Si4O12•6(H2O) R 3 m 3 2/m
77.01.02.08a Levyne-Na ! (Na2,Ca,K2)Al2Si4O12•6(H2O) R 3 m 3 2/m
77.01.02.09 Tschortnerite ! Ca4(Ca,Sr,K,Ba)3Cu3(OH)8[Si12Al12O48]•x(H2O),x>=20 F m3m 4/m 3 2/m
Strunz Class:
09.GD.30 09 - SILICATES (Germanates)
09.G - Tektosilicates with Zeolitic H2O
09.GD -Chains of 6-membered rings � tabular zeolites
09.GD.30 Faujasite-Ca ! (Ca,Na2,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
09.GD.30 Faujasite-Mg ! (Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
09.GD.30 Faujasite-Na (Na2,Ca,Mg)3.5[Al7Si17O48]•32(H2O) F d3m 4/m 3 2/m
Other Faujasite-Mg Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
See Also:
Links to other databases for Faujasite-Mg :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Faujasite-Mg
(Mg,Na2,Ca)3.5[Al7Si17O48]•32(H2O)
Dana No: 77.01.02.07b Strunz No: 09.GD.30
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