Corrensite Mineral Data

General Corrensite Information

Chemical Formula:

(Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O)

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

Empirical Formula:

Ca_0.6Na_0.2K_0.2Mg₅Fe²⁺₃AlSi₆Al₂O₂₀(OH)₁₀ï¿½9(H₂O)

Environment:

Authigenic chlorite mineral in sediments, hydrothermally altered materials, and igneous rocks. 1:1 regular interstratification of trioctahedral chlorite and trioctahedral smectite.

IMA Status:

Valid Species (Pre-IMA) 1954

Locality:

Zaiserweiher bei Maulbronn, Baden-Wurttenberg, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Carl Whilom Correns (1893-1980), German mineralogist and director of the Sedimentary Petrology Institute, University of Gottingen.

Synonym:

Swelling chlorite

Corrensite Image

Images:

Corrensite

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

Images:

Corrensite

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

Corrensite Crystallography

Axial Ratios:

a:b:c =0.5763:1:3.1857

Cell Dimensions:

a = 5.337, b = 9.26, c = 29.5, Z = 2; V = 1,457.91 Den(Calc)= 2.80

Crystal System:

Orthorhombic Space Group: Unk

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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

Cleavage:

{001} Perfect

Color:

White, Pink, Brown, Gray, Yellowish green.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

1-2 - Between Talc and Gypsum

Luster:

Earthy (Dull)

Streak:

white

Optical Properties of Corrensite

Gladstone-Dale:

CI calc= 0.089 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2103,KC= 0.2309
Ncalc = 1.65

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.

Pleochroism (x):

yellowish ocher.

Pleochroism (y):

brownish green.

Pleochroism (z):

brownish green.

Calculated Properties of Corrensite

Electron Density:

Bulk Density (Electron Density)=2.82 gm/cc
note: Specific Gravity of Corrensite =2.80 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Corrensite= 5.24 barns/electron
U=PE_Corrensite x r_electron= 14.79 barns/cc.

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

Dana Class:

71.04.02.05 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.04)interlayered 1:1, 2:1, and octahedra

(71.04.02)Interstratified Chlorite-Smectite group

71.04.02.01 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

71.04.02.02 Lunijianlaite LiAl6(Si7Al)O20(OH)10 Unk Mono

71.04.02.03 Saliotite Na0.5Li0.5Al3AlSi3O10(OH)5 C 2/m 2/m

71.04.02.04 Tosudite Na0,5(Al,Mg)6(Si,Al)8O18(OH)12•5(H2O) Unk Ortho

71.04.02.05 Corrensite (Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O) Unk Ortho

71.04.02.06 Kulkeite Na0.35Mg8AlSi7O20(OH)10 Unk Mono

71.04.02.07 Rectorite (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O) Unk Mono

71.04.02.08 Aliettite [Mg3Si4O10(OH)2](Ca0.5,Na)0.33(Al,Mg,Fe)2-3(Si,Al)4O10(OH)2•n(H2O) Unk Mono

71.04.02.09 Glagolevite! NaMg6[Si3AlO10](OH,O)8•H2O C1 1

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

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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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Corrensite

(Ca,Na,K)(Mg,Fe,Al)9(Si,Al)8O20(OH)10•n(H2O)
Dana No: 71.04.02.05 Strunz No: 09.EC.60
Locality:

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