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 % K2 O
Sodium 0.37 % Na 0.51 % Na2 O
Calcium 1.96 % Ca 2.74 % CaO
Magnesium 9.90 % Mg 16.42 % MgO
Aluminum 6.60 % Al 12.46 % Al2 O3
Iron 13.65 % Fe 17.56 % FeO
Silicon 13.73 % Si 29.38 % SiO2
Hydrogen 2.30 % H 20.55 % H2 O
Oxygen 50.85 % O
______ ______
100.00 % 100.39 % = TOTAL OXIDE
Empirical Formula:
Ca0.6 Na0.2 K0.2 Mg5 Fe2+ 3 AlSi6 Al2 O20 (OH)10 �9(H2 O)
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 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
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
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:
PECorrensite = 5.24 barns/electronU=PECorrensite 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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