General Stilbite-Ca Information
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Chemical Formula: |
NaCa4[Al8Si28O72]·n(H2O) (n=28-32) |
Composition: |
Molecular Weight = 2,877.96 gm |
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Sodium 0.80 % Na 1.08 % Na2O |
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Calcium 5.57 % Ca 7.79 % CaO |
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Aluminum 7.50 % Al 14.17 % Al2O3 |
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Silicon 27.32 % Si 58.46 % SiO2 |
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Hydrogen 2.10 % H 18.78 % H2O |
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Oxygen 56.70 % O |
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______ ______ |
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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. |
Synonym: |
Aedelforsite |
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Bundle zeolite |
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Desmine |
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Stilbite |
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Stilbite-Ca Image |
Images:
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Images:
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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 |
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Stilbite-Ca Crystallography
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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/Io): 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]
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Physical Properties of Stilbite-Ca
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Cleavage: |
[010] Perfect |
Color: |
White, Red, Yellow, Brown, Cream. |
Density: |
2.1 - 2.2, Average = 2.15 |
Diaphaniety: |
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 |
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Optical Properties of Stilbite-Ca
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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 |
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. |
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Calculated Properties of Stilbite-Ca
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Electron Density: |
relectron=2.19 gm/cc note: rStilbite-Ca =2.15 gm/cc. |
Fermion Index |
Fermion Index = 0.01311 Boson Index = 0.98689 |
Photoelectric: |
PEStilbite-Ca = 2.00 barns/electron U=PEStilbite-Ca x relectron= 4.36 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Stilbite-Ca is Not Radioactive |
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Stilbite-Ca Classification
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Dana Class: |
77.1.4.3 (77)Tectosilicate Zeolite group |
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(77.1)true zeolites |
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(77.1.4)Heulandite and related species |
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77.1.4.1 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1a Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1b Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m |
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77.1.4.1c Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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77.1.4.1d Heulandite-Ba! (Ba,Ca,K,Na,Sr)5Al9Si27O72·22(H2O) C 2/m 2/m |
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77.1.4.2 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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77.1.4.2a Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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77.1.4.2b Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m |
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77.1.4.3 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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77.1.4.3a Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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77.1.4.4 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m |
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77.1.4.5 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m |
Strunz Class: |
VIII/J.23-30 VIII - Silicates |
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VIII/J - Tectosilicates (network), with zeolite-structure, Bladed Zeolites |
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VIII/J.23 - Zeolite group, Heulandite - Barium-brewsterite series |
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VIII/J.23-06 Heulandite-Na! (Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-08 Heulandite-K! (K,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 2/m |
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VIII/J.23-10 Heulandite-Ca (Ca,Na)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-12 Heulandite-Sr! (Sr,Na,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, Cm, C 2 Mono |
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VIII/J.23-18 Clinoptilolite-Na! (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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VIII/J.23-20 Clinoptilolite-K (Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m, C 2, Cm Mono |
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VIII/J.23-22 Clinoptilolite-Ca! (Ca,Na,K)2-3Al3(Al,Si)2Si13O36·12(H2O) C 2/m 2/m |
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VIII/J.23-26 Stilbite-Na! Na3Ca3[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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VIII/J.23-30 Stilbite-Ca NaCa4[Al8Si28O72]·n(H2O)(n=28-32) C 2/m 2/m |
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VIII/J.23-40 Barrerite (Na,K,Ca)2Al2Si7O18·6(H2O) Amma or Ammm 2/m 2/m 2/m |
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VIII/J.23-50 Stellerite CaAl2Si7O18·7(H2O) F mmm 2/m 2/m 2/m |
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VIII/J.23-60 Goosecreekite CaAl2Si6O16·5(H2O) P 21 2 |
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VIII/J.23-70 Epistilbite CaAl2Si6O16·5(H2O) C1 1 |
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VIII/J.23-80 Brewsterite-Sr (Sr,Ba)Al4Si12O32·10(H2O) P 21/m 2/m |
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VIII/J.23-90 Brewsterite-Ba! (Ba,Sr)Al2Si6O16·5(H2O) P 21/m,P 21 Mono |
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Other Stilbite-Ca Information
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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 -Google Images
4 -Google Scholar
5 -MinDAT
6 -MinMax(Deutsch)
7 -MinMax(English)
8 -Mineralienatlas (Deutsch)
9 -QUT Mineral Atlas
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Stilbite-Ca
NaCa4[Al8Si28O72]·n(H2O) (n=28-32)
Dana No: 77.1.4.3 Strunz No: VIII/J.23-30
Locality:
Notes:
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