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Stilbite-Na Mineral Data

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General Stilbite-Na Information

Help on Chemical  Formula: Chemical Formula: Na3Ca3[Al8Si28O72]•n(H2O) (n=28-32)
Help on Composition: Composition: Molecular Weight = 2,883.86 gm
   Sodium     2.39 %  Na    3.22 % Na2O
   Calcium    4.17 %  Ca    5.83 % CaO
   Aluminum   7.48 %  Al   14.14 % Al2O3
   Silicon   27.27 %  Si   58.34 % SiO2
   Hydrogen   2.10 %  H    18.74 % H2O
   Oxygen    56.59 %  O
            ______        ______ 
            100.00 %      100.28 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na3Ca3Al8Si28O72•30(H2O)
Help on Environment: Environment: Amygdaloidal cavities in basalts and similar rocks.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Capo Pula, Cagliari, Sardinia, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek stilbe - "luster" in allusion to the pearly to vitreous luster. The Na-dominant member of the stilbite series.
Help on Name Pronunciation: Name Pronunciation: Stilbite-Na Say STILBITE-NA
Help on Synonym: Synonym: Aedelforsite
  Bundle zeolite

Stilbite-Na Image

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Comments: Stibite 'bow-ties' on matrix.
Location: Cape Pula, Pula, Cagliari Province, Sardinia, Italy. Scale: Largest Crystal Length 3 cm.
© Ed Rosenzweig

Stilbite-Na Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.7501:1:0.6224
Help on Cell Dimensions: Cell Dimensions: a = 13.63, b = 18.17, c = 11.31, Z = 1; beta = 129.166° V = 2,171.67 Den(Calc)= 2.20
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 9.04(1), 4.07(0.95), 3.04(0.7),

Physical Properties of Stilbite-Na

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: White, Red, Yellow, Brown, Cream.
Help on Density: Density: 2.1 - 2.2, Average = 2.15
Help on Diaphaneity: Diaphaneity: Transparent to Subtransparent to translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Globular - Spherical, or nearly so, rounded forms (e.g. wavellite).
Help on Habit: Habit: Wheat Sheaf - Bundle shaped aggregates resembling wheat sheafs after hand reaping wheat.
Help on Hardness: Hardness: 3.5-4 - Copper Penny-Fluorite
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Stilbite-Na

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.017 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.04 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2235,KPDmeas= 0.2287,KC= 0.2327
Ncalc = 1.49 - 1.51
Help on Optical Data: Optical Data: Biaxial (-), a=1.479-1.492, b=1.485-1.5, g=1.489-1.505, bire=0.0100-0.0130, 2V(Calc)=76-78, 2V(Meas)=22-79. Dispersion weak, r < v.

Calculated Properties of Stilbite-Na

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.18 gm/cc
note: Specific Gravity of Stilbite-Na =2.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEStilbite-Na = 1.85 barns/electron
U=PEStilbite-Na x rElectron Density= 4.04 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stilbite-Na is Not Radioactive

Stilbite-Na Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.04)Heulandite and related species Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m Stilbite-Ca NaCa4[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m Barrerite (Na,K,Ca)2Al2Si7O18•6(H2O) Amma or Ammm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GE.10 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GE -Chains of T10O20 Tetrahedra
09.GE.10 Stilbite-Ca NaCa4[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m
09.GE.10 Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m

Other Stilbite-Na Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Stilbite-Na :
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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Na3Ca3[Al8Si28O72]•n(H2O) (n=28-32)
Dana No: Strunz No: 09.GE.10





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