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Corrensite Mineral Data

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General Corrensite Information

Help on Chemical  Formula: Chemical Formula: (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O)
Help on Composition: Composition: Molecular Weight = 1,227.19 gm
   Potassium   0.64 %  K     0.77 % K2O
   Sodium      0.37 %  Na    0.51 % Na2O
   Calcium     1.96 %  Ca    2.74 % CaO
   Magnesium   9.90 %  Mg   16.42 % MgO
   Aluminum    6.60 %  Al   12.46 % Al2O3
   Iron       13.65 %  Fe   17.56 % FeO
   Silicon    13.73 %  Si   29.38 % SiO2
   Hydrogen    2.30 %  H    20.55 % H2O
   Oxygen     50.85 %  O
             ______        ______ 
             100.00 %      100.39 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.6Na0.2K0.2Mg5Fe2+3AlSi6Al2O20(OH)10�9(H2O)
Help on Environment: Environment: Authigenic chlorite mineral in sediments, hydrothermally altered materials, and igneous rocks. 1:1 regular interstratification of trioctahedral chlorite and trioctahedral smectite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1954
Help on Locality: Locality: Zaiserweiher bei Maulbronn, Baden-Wurttenberg, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Carl Whilom Correns (1893-1980), German mineralogist and director of the Sedimentary Petrology Institute, University of Gottingen.
Help on Synonym: Synonym: Swelling chlorite

Corrensite Image

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Comments: Platy, authigenic chloritic mixed-layer clays (Corrensite?), lining the pore spaces of a sandstone. SEM image from a core sample.
Location: Unknown. Scale: Picture size 33 µ-m.
© OMNI Laboratories, Inc

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Comments: White earthy crust of corrensite on matrix.
Location: Bolet, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Corrensite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5763:1:3.1857
Help on Cell Dimensions: Cell Dimensions: a = 5.337, b = 9.26, c = 29.5, Z = 2; V = 1,457.91 Den(Calc)= 2.80
Help on Crystal System: Crystal System: Orthorhombic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 14(1), 3.53(0.6), 7.08(0.6),2.57(0.3), 4.62(0.3), 4.72(0.3), 7.83(0.3), 29(0.3),

Physical Properties of Corrensite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: White, Pink, Brown, Gray, Yellowish green.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Microscopic Crystals - Crystals visible only with microscopes.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Corrensite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2103,KC= 0.2309
Ncalc = 1.65
Help on Optical Data: Optical Data: Biaxial (-), a=1.56-1.585, b=1.582-1.612, g=1.582-1.612, bire=0.0220-0.0270, 2V(Calc)=0, 2V(Meas)=0-10.
Help on Pleochroism (x): Pleochroism (x): yellowish ocher.
Help on Pleochroism (y): Pleochroism (y): brownish green.
Help on Pleochroism (z): Pleochroism (z): brownish green.

Calculated Properties of Corrensite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Corrensite =2.80 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECorrensite = 5.24 barns/electron
U=PECorrensite x relectron= 14.79 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 9.27 (Gamma Ray American Petroleum Institute Units)
Concentration of Corrensite per GRapi unit = 10.79 (%)

Estimated Radioactivity from Corrensite - barely detectable


Corrensite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.04)interlayered 1:1, 2:1, and octahedra
  (71.04.02)Interstratified Chlorite-Smectite group Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1
Help on  Strunz Class: Strunz Class: 09.EC.60 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.60 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono
09.EC.60 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m
09.EC.60 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho
09.EC.60 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono
09.EC.60 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono
09.EC.60 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m
09.EC.60 Hydrobiotite [K(Mg,Fe)3(Al,Fe)Si3O10(OH,F)2]•[(Mg,Fe,Al)3(Si,Al)4O10(OH)2•4(H2O)] C 2/m 2/m
09.EC.60 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono
09.EC.60 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono
09.EC.60 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m
09.EC.60 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho
09.EC.60 Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4•3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

Other Corrensite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Corrensite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.EC.60





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