Okenite Mineral Data

Okenite Mineral Data
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General Okenite Information

Help on Chemical Formula: Chemical Formula: Ca3[Si6O15]•6(H2O)
Help on Composition: Composition: Molecular Weight = 1,966.57 gm
   Calcium   20.38 %  Ca   28.52 % CaO
   Silicon   25.71 %  Si   55.00 % SiO2
   Hydrogen   1.85 %  H    16.49 % H2O
   Oxygen    52.07 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca10Si18O46•18(H2O)
Help on Environment: Environment: Secondary mineral from the alteration of basalts.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1828
Help on Locality: Locality: Disko Island, Greenland. Poona, near Bombay, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Lorenz Oken (1779-1851), German natural historian, Munich Germany.
Help on Name Pronunciation: Name Pronunciation: Okenite Say OKENITE
Help on Synonym: Synonym: ICSD 31207
  PDF 33-305
 

Okenite Image

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Okenite

Comments: Cotton-ball cluster of white okenite crystals.
Location: Khandivali quarry, Maharashtra, India. Scale: 3x3x2 cm.
© John Betts - Fine Minerals

Okenite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =1.331:1:3.0219
Help on Cell Dimensions: Cell Dimensions: a = 9.69, b = 7.28, c = 22, Z = 1; alpha = 97.5°, beta = 101.1°, gamma = 110.9° V = 1,410.54 Den(Calc)= 2.31
Help on Crystal System: Crystal System: TriclinicSpace Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 21(1), 3.56(0.8), 8.8(0.8),
Click Here for Large Okenite Structure Window Crystal Structure:

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Merlino S , American Mineralogist , 68 (1983) p.614-622, Okenite, Ca10Si18O46*18H2O: the first example of a chain and sheet silicate

 

Physical Properties of Okenite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: White, Yellowish white, Bluish white.
Help on Density: Density: 2.3 - 2.33, Average = 2.31
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Capillary - Very slender and long, like a thread or hair (e.g. millerite).
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5 - Apatite
Help on Luminescence: Luminescence: Non-Fluorescent.
Help on Luster: Luster: Pearly
Help on Streak: Streak: white
 

Optical Properties of Okenite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2234,KPDmeas= 0.2268,KC= 0.2303
Ncalc = 1.53 - 1.54
Help on Optical Data: Optical Data: Biaxial (-), a=1.512-1.532, b=1.514-1.535, g=1.515-1.542, bire=0.0030-0.0100, 2V(Calc)=68-70, 2V(Meas)=60. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.
 

Calculated Properties of Okenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.35 gm/cc
note: Specific Gravity of Okenite =2.32 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEOkenite = 3.48 barns/electron
U=PEOkenite x rElectron Density= 8.20 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Okenite is Not Radioactive
 

Okenite Classification
Help on Dana Class: Dana Class: 72.03.02.05 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.03)with 3-, 4-, or 5-membered rings and 8-membered rings
  (72.03.02)Tobermorite group (5- & 8-membered rings)
 
72.03.02.01 Tobermorite Ca5Si6O16(OH)2•4(H2O) C 2221 2 2 2
 
72.03.02.02 Clinotobermorite Ca5Si6(O,OH)18•5(H2O) Cc,C 2/c Mono
 
72.03.02.03 Plombierite Ca5H2Si6O18•6H2O B11b 2
 
72.03.02.04 Riversideite Ca5Si6O16(OH)2•2(H2O) B2212 2 2 2
 
72.03.02.05 Okenite Ca3[Si6O15]•6(H2O) P1 or P1 Tri
 
72.03.02.06 Tacharanite Ca12Al2Si18O33(OH)36 A centered Mono
 
72.03.02.07 Nekoite Ca3Si6O15•7(H2O) P1 1
 
72.03.02.08 Oyelite Ca10B2Si8O29•12(H2O) B**** Ortho
Help on Strunz Class: Strunz Class: 09.EA.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EA -Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
 
09.EA.40 Okenite Ca3[Si6O15]•6(H2O) P1 or P1 Tri
 

Other Okenite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Okenite :
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 - Glendale Community College
8 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (MinSocAm)
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
18 - theimage

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Okenite

Ca3[Si6O15]•6(H2O)
Dana No: 72.03.02.05 Strunz No: 09.EA.40
Locality:

 

Notes: