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Epistilbite Mineral Data

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General Epistilbite Information

Help on Chemical  Formula: Chemical Formula: CaAl2Si6O16•5(H2O)
Help on Composition: Composition: Molecular Weight = 608.62 gm
   Calcium    6.59 %  Ca    9.21 % CaO
   Aluminum   8.87 %  Al   16.75 % Al2O3
   Silicon   27.69 %  Si   59.23 % SiO2
   Hydrogen   1.66 %  H    14.80 % H2O
   Oxygen    55.20 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CaAl2Si6O16•5(H2O)
Help on Environment: Environment: Alteration product in basalts.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1826
Help on Locality: Locality: Berufjord, Iceland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek epi - "near" and the mineral Stilbite.
Help on Name Pronunciation: Name Pronunciation: Epistilbite + Pronunciation Say EPISTILBITE
Help on Synonym: Synonym: ICSD 82770
  PDF 39-1381
 

Epistilbite Image

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  Epistilbite   Quartz

Comments: White epistilbite cluster 25 mm across on amethyst quartz crystal matrix.
Location: Sawda, Jalgaon, Maharashtra, India. Scale: 10x8x5 cm.
© John Betts - Fine Minerals

Epistilbite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.512:1:0.5755
Help on Cell Dimensions: Cell Dimensions: a = 9.083, b = 17.738, c = 10.209, Z = 4; alpha = 89.95°, beta = 124.58°, gamma = 90° V = 1,354.23 Den(Calc)= 2.98
Help on Crystal System: Crystal System: Triclinic - Pedial H-M Symbol (1) Space Group: C1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.45(1), 3.21(0.9), 8.89(0.9),
 

Physical Properties of Epistilbite

Help on Cleavage: Cleavage: {010} Perfect
Help on Color: Color: White, Yellowish white, Reddish white, Brownish white.
Help on Density: Density: 2.2 - 2.3, Average = 2.25
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Epistilbite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.008 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.251 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1705,KPDmeas= 0.2258,KC= 0.2276
Ncalc = 1.5 - 1.68
Help on Optical Data: Optical Data: Biaxial (-), a=1.502, b=1.51, g=1.512, bire=0.0100, 2V(Calc)=52, 2V(Meas)=44. Dispersion relatively strong.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Epistilbite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Epistilbite =2.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEEpistilbite = 2.15 barns/electron
U=PEEpistilbite x rElectron Density= 4.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Epistilbite is Not Radioactive
 

Epistilbite Classification

Help on  Dana Class: Dana Class: 77.01.06.02 (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.06)Mordenite and related species
 
77.01.06.01 Mordenite (Ca,Na2,K2)Al2Si10O24•7(H2O) C mc21 mm2
 
77.01.06.02 Epistilbite CaAl2Si6O16•5(H2O) C1 1
 
77.01.06.03 Maricopaite Pb7Ca2(Si,Al)48O100•32(H2O) Cm2m 2/m 2/m 2/m
 
77.01.06.04 Dachiardite-Ca (Ca,Na2,K2)5Al10Si38O96•25(H2O) C 2/m 2/m
 
77.01.06.05 Dachiardite-Na (Na2,Ca,K2)4Al4Si20O48•13(H2O) C 2/m 2/m
 
77.01.06.06 Ferrierite-Mg (Mg,Na,K)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m
 
77.01.06.06a Ferrierite-K! (K,Na)2Mg(Si,Al)18O36•9(H2O) Pnnm 2/m 2/m 2/m
 
77.01.06.06b Ferrierite-Na! (Na,K)2Mg(Si,Al)18O36•9(H2O) P 21/n 2/m
 
77.01.06.07 Boggsite NaCa2(Al5Si19O48)•17(H2O) I mma 2/m 2/m 2/m
 
77.01.06.08 Gottardiite! Na3Mg3Ca5Al19Si117O272•93(H2O) C mca 2/m 2/m 2/m
 
77.01.06.09 Terranovaite! (Na,Ca)8(Si68Al12)O160•29(H2O) C mcm 2/m 2/m 2/m
 
77.01.06.10 Mutinaite! Na3Ca4Si85Al11O192•60(H2O) P nma 2/m 2/m 2/m
 
77.01.06.12 Direnzoite! NaK6MgCa2(Al13Si47O120)•36H2O Pmmn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.GD.45 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GD -Chains of 6-membered rings � tabular zeolites
 
09.GD.45 Epistilbite CaAl2Si6O16•5(H2O) C1 1
 

Other Epistilbite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Epistilbite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
17 - Zeolite Database by Bruno Herreros

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Epistilbite

CaAl2Si6O16•5(H2O)
Dana No: 77.01.06.02 Strunz No: 09.GD.45
Locality:

 

Notes:

 

 
   
 


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