Stilbite-Ca Mineral Data

General Stilbite-Ca Information

Chemical Formula: NaCa4[Al8Si28O72]•n(H2O) (n=28-32) Composition: Molecular Weight = 2,877.96 gm    Sodium     0.80 %  Na    1.08 % Na₂O    Calcium    5.57 %  Ca    7.79 % CaO    Aluminum   7.50 %  Al   14.17 % Al₂O₃    Silicon   27.32 %  Si   58.46 % SiO₂    Hydrogen   2.10 %  H    18.78 % H₂O    Oxygen    56.70 %  O             ______        ______              100.00 %      100.28 % = TOTAL OXIDE Empirical Formula: NaCa₄Al₈Si₂₈O₇₂•30(H₂O) Environment: Amygdaloidal cavities in basalts and similar rocks. Redefined from stilbite by IMA zeolite committee. IMA Status: Valid Species (Pre-IMA) 1801 Locality: Haüy mentioned occurrences in Iceland, Andreasberg in Harz, Alpes Dauphinoises and Norway, but no clear type-locality. Link to MinDat.org Location Data. Name Origin: From the Greek stilbe - "luster" in allusion to the pearly to vitreous luster. Ca modifier added by zeolite committee. Name Pronunciation: Stilbite-Ca Synonym: Aedelforsite   Bundle zeolite   Desmine   Stilbite  

Stilbite-Ca Image

Images:

Stilbite-Ca   Apophyllite   Apophyllite-(KOH) Comments: 3 cm. pink-colored rosette of stilbite and clear "apophyllite" (probably hydroxyapophyllite) in an amygdaloidal cavity. Location: Aurangabad District, Jalgaon, India. Scale: Specimen size 6 cm. © Dave Barthelmy

Images: Images: Images:

Stilbite-Ca   Thomsonite-Ca Comments: Peach colored stilbite crystals to 3.5 cm in size is hosting two finely crystallized balls of powdery white thomsonite. Location: Near Jalgaon, Maharashtra State, India. Scale: Picture size 15 cm. © Dan Weinrich

Stilbite-Ca Crystallography

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

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Cruciani G , Artioli G , Gualtieri A , Stahl K , Hanson J C , American Mineralogist , 82 (1997) p.729-739, Dehydration dynamics of stilbite using synchrotron X-ray powder diffraction, Sample: at T = 315 K View Additional jPOWD Structure files for Stilbite-Ca [1] [2] [3] [4]

 

Physical Properties of Stilbite-Ca

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

Optical Properties of Stilbite-Ca

Gladstone-Dale: CI meas= 0.019 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2235,KPDmeas= 0.2287,KC= 0.2332
Ncalc = 1.49 - 1.51 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-Ca

Electron Density: Bulk Density (Electron Density)=2.19 gm/cc
note: Specific Gravity of Stilbite-Ca =2.15 gm/cc.
Fermion Index: Fermion Index = 0.01
Boson Index = 0.99 Photoelectric: PE_Stilbite-Ca = 2.00 barns/electron
U=PE_Stilbite-Ca x rElectron Density= 4.36 barns/cc.
Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stilbite-Ca is Not Radioactive  

Stilbite-Ca Classification

Dana Class: 77.01.04.03 (77)Tectosilicate Zeolite group   (77.01)true zeolites   (77.01.04)Heulandite and related species  

77.01.04.01 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

 

77.01.04.01a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

 

77.01.04.01b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 2/m

 

77.01.04.01c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, Cm, C 2 Mono

 

77.01.04.01d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72•22(H2O) C 2/m 2/m

 

77.01.04.02 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

 

77.01.04.02a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m, C 2, Cm Mono

 

77.01.04.02b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36•12(H2O) C 2/m 2/m

 

77.01.04.03 Stilbite-Ca NaCa4[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m

 

77.01.04.03a Stilbite-Na! Na3Ca3[Al8Si28O72]•n(H2O)(n=28-32) C 2/m 2/m

 

77.01.04.04 Stellerite CaAl2Si7O18•7(H2O) F mmm 2/m 2/m 2/m

 

77.01.04.05 Barrerite (Na,K,Ca)2Al2Si7O18•6(H2O) Amma or Ammm 2/m 2/m 2/m

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-Ca Information

References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) See Also: Links to other databases for Stilbite-Ca :
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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