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Rectorite Mineral Data

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General Rectorite Information

Help on Chemical  Formula: Chemical Formula: (Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O)
Help on Composition: Composition: Molecular Weight = 784.18 gm
   Potassium   0.50 %  K     0.60 % K2O
   Sodium      1.76 %  Na    2.37 % Na2O
   Calcium     1.53 %  Ca    2.15 % CaO
   Aluminum   20.64 %  Al   39.01 % Al2O3
   Silicon    21.49 %  Si   45.97 % SiO2
   Hydrogen    1.03 %  H     9.19 % H2O
   Oxygen     53.05 %  O
             ______        ______ 
             100.00 %       99.29 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.6Ca0.3K0.1Al6Si6O20(OH)4•2(H2O)
Help on Environment: Environment: Alteration of potassic feldspars or diagenesis of muscovite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1891
Help on Locality: Locality: Blue Mountain district, Marble, Garland County, Arkansas, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for E. W. Rector (1849-1917), legislator and lawyer of Hot Springs, Arkansas, USA.
Help on Name Pronunciation: Name Pronunciation: Rectorite + Pronunciation Say RECTORITE
Help on Synonym: Synonym: Ca-Rectorite
  K-Rectorite
  Na-Rectorite
  Smectite
  Tarasovite
 

Rectorite Image

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  Rectorite

Comments: Blue Mountain District, Marble Township, Garland Co., Arkansas, USA.
Location: Five pieces of leather-like fragments of rectorite in twisted, irregular shapes. Scale: Specimen size 1-4 cm.
© John Betts - Fine Minerals

Rectorite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5777:1:2.6858
Help on Cell Dimensions: Cell Dimensions: a = 5.13, b = 8.88, c = 23.85, Z = 2; beta = 96.3° V = 1,079.91 Den(Calc)= 2.41
Help on Crystal System: Crystal System: Monoclinic Space Group: Unk
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.45(1), 2.55(0.7), 1.492(0.4),12.2(0.4), 3.15(0.3), 4.99(0.3), 26.4(0.3), 2.44(0.1),
 

Physical Properties of Rectorite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Yellowish white, White.
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Hardness: Hardness: 1-2 - Between Talc and Gypsum
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white
 

Optical Properties of Rectorite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2252,KC= 0.2178
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (-), a=1.519, b=1.55, g=1.559, bire=0.0400, 2V(Calc)=54, 2V(Meas)=5-20. Dispersion r > v.
 

Calculated Properties of Rectorite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.41 gm/cc
note: Specific Gravity of Rectorite =2.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PERectorite = 1.72 barns/electron
U=PERectorite x relectron= 4.14 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 7.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Rectorite per GRapi unit = 13.89 (%)

Estimated Radioactivity from Rectorite - barely detectable

 

Rectorite Classification

Help on  Dana Class: Dana Class: 71.04.02.07 (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
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 Rectorite 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 Rectorite :
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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Print or Cut-and-Paste your Rectorite Specimen Label here :

Rectorite

(Na,Ca)Al4(Si,Al)8O20(OH)4•2(H2O)
Dana No: 71.04.02.07 Strunz No: 09.EC.60
Locality:

 

Notes:

 

 
   
 


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