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Rectorite

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Formula:
(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
System:
Monoclinic
Colour:
White to light brown
Hardness:
1 - 2
Name:
Named in 1891 by Richard Newman Brackett and John Francis Williams in honor of Colonel Elias William Rector [June 11, 1847 Little Rock, Arkansas,, USA - January 29, 1917 Hot Spring, Arkansas, USA], a politician (Speaker of the Arkansas House of Representatives) and attorney in Hot Springs, Arkansas, who supported the formation of the Arkansas Geological Survey.
A 1:1 regular interstratification of muscovite/illite (dioctahedral mica) and montmorillonite (dioctahedral smectite). Frequently called "rectorite-K" to distinguish it from regularly interstratified paragonite/montmorillonite = "rectorite-Na".

Classification of Rectorite

Approved
9.EC.60

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
71.4.2.7

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
4 : Sheets of 6-membered rings interlayered 1:1, 2:1, and octahedra
16.2.9

16 : Silicates Containing Aluminum and other Metals
2 : Aluminosilicates of Na
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Type Occurrence of Rectorite

Year of Discovery:
1891

Physical Properties of Rectorite

Waxy, Earthy
Colour:
White to light brown
Hardness (Mohs):
1 - 2

Crystallography of Rectorite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.13Å, b = 8.88Å, c = 23.85Å
β = 96.3°
Ratio:
a:b:c = 0.578 : 1 : 2.686
Unit Cell Volume:
V 1,079.91 ų (Calculated from Unit Cell)

Optical Data of Rectorite

Type:
Biaxial (-)
RI values:
nα = 1.519 nβ = 1.550 nγ = 1.559
2V:
Measured: 5° to 20°, Calculated: 54°
Max Birefringence:
δ = 0.040
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r > v

Chemical Properties of Rectorite

Formula:
(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2O
Essential elements:
All elements listed in formula:
Common Impurities:
Fe,K

Relationship of Rectorite to other Species

9.EC.05Minnesotaite(Fe,Mg)3(Si4O10)(OH)2
9.EC.05TalcMg3(Si4O10)(OH)2
9.EC.05Willemseite(Ni,Mg)3(Si4O10)(OH)2
9.EC.10FerripyrophylliteFe23+(Si4O10)(OH)2
9.EC.10PyrophylliteAl2(Si4O10)(OH)2
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2
9.EC.15CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
9.EC.15Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
9.EC.15Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
9.EC.15MuscoviteKAl2(AlSi3O10)(OH)2
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2
9.EC.15ParagoniteNaAl2(AlSi3O10)(OH)2
9.EC.15RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
9.EC.15Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
9.EC.15AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
9.EC.15FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
9.EC.15FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
9.EC.15ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
9.EC.15TainioliteKLiMg2(Si4O10)F2
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
9.EC.20AnniteKFe32+(AlSi3O10)(OH)2
9.EC.20EphesiteLiNaAl2(Al2Si2O10)(OH)2
9.EC.20HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
9.EC.20NorrishiteKLiMn23+(Si4O10)O2
9.EC.20PhlogopiteKMg3(AlSi3O10)(OH)2
9.EC.20PolylithioniteKLi2Al(Si4O10)(F,OH)2
9.EC.20PreiswerkiteNaMg2Al(Al2Si2O10)(OH)2
9.EC.20SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
9.EC.20FluorotetraferriphlogopiteKMg3(Fe3+Si3O10)F2
9.EC.20Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
9.EC.20EastoniteKMg2Al(Al2Si2O10)(OH)2
9.EC.20TetraferrianniteKFe32+((Fe3+,Al)Si3O10)(OH)2
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
9.EC.20FluoranniteKFe32+(AlSi3O10)(F,OH)2
9.EC.20ShirokshiniteKNaMg2(Si4O10)F2
9.EC.20ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
9.EC.20SokolovaiteCsLi2Al(Si4O10)F2
9.EC.20AspidoliteNaMg3(AlSi3O10)(OH)2
9.EC.20FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe32+(AlSi3O10)(OH)2
9.EC.20YangzhumingiteKMg2.5(Si4O10)F2
9.EC.20OrloviteKLi2Ti(Si4O10)OF
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
9.EC.35BityiteLiCaAl2(AlBeSi2O10)(OH)2
9.EC.35ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
9.EC.35FluorokinoshitaliteBaMg3(Al2Si2O10)F2
9.EC.40Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V25+Si5O35 · 27H2O (?)
9.EC.40Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O
9.EC.40NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2O
9.EC.40VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2O
9.EC.40Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2O
9.EC.45HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2
9.EC.45SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2O
9.EC.45SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.45SpadaiteMgSiO2(OH)2 · H2O (?)
9.EC.45Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
9.EC.45SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
9.EC.45ZincsiliteZn3(Si4O10)(OH)2 · 4H2O
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2O
9.EC.50Vermiculite(Mg,Fe,Al)3((Al,Si)4O10)(OH)2 · 4H2O
9.EC.55Baileychlore(Zn,Fe,Al,Mg)6((Si,Al)4O10)(OH)8
9.EC.55Chamosite(Fe2+,Mg)5Al(AlSi3O10)(OH)8
9.EC.55Clinochlore(Mg,Fe2+)5Al(AlSi3O10)(OH)8
9.EC.55Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
9.EC.55FranklinfurnaceiteCa2Fe3+Mn32+Mn3+(Zn2Si2O10)(OH)8
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55PennantiteMn52+Al(AlSi3O10)(OH)8
9.EC.55Sudoite(Mg,Fe2+)2Al3(AlSi3O10)(OH)8
9.EC.55DonbassiteAl4.33(AlSi3O10)(OH)8
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8
9.EC.55BorocookeiteLi1+3xAl4-x(BSi3O10)(OH)8
9.EC.60AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2O
9.EC.60Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2O
9.EC.60DozyiteMg7Al2(Al2Si4O15)(OH)12
9.EC.60HydrobiotiteK(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2O
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)
9.EC.60KulkeiteMg8Al(AlSi7O20)(OH)10
9.EC.60LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10
9.EC.60Saliotite(Li,Na)Al3(AlSi3O10)(OH)5
9.EC.60TosuditeNa0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2O
9.EC.60BrinrobertsiteNa0.3Al4(Si4O10)2(OH)4 · 3.5 H2O
9.EC.65Macaulayite(Fe,Al)24Si4O43(OH)2
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
9.EC.75Ferrisurite(Pb,Ca)2.4Fe23+(Si4O10)(CO3)1.7(OH)3 · nH2O
9.EC.75Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2O
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8
16.2.1AlbiteNaAlSi3O8
16.2.2AnalcimeNa2(Al2Si4O12) · 2H2O
16.2.3UssingiteNa2AlSi3O8OH
16.2.4ParagoniteNaAl2(AlSi3O10)(OH)2
16.2.5NatroliteNa2Al2Si3O10 · 2H2O
16.2.6Tetranatrolite
16.2.7ParanatroliteNa2Al2Si3O10 · 3H2O
16.2.8EphesiteLiNaAl2(Al2Si2O10)(OH)2
16.2.10JadeiteNa(Al,Fe3+)Si2O6
16.2.11Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2

Other Names for Rectorite

Name in Other Languages:
German:Rectorit
Simplified Chinese:累托石
Spanish:Rectorita
Traditional Chinese:累托石

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Rectorite

Reference List:
American Mineralogist (1982): 67: 394-398.

Clays and Clay Minerals: 18: 115-119.

American Mineralogist (1995): 80: 247.

Clay Minerals (1997): 32: 89-95.

Internet Links for Rectorite

Localities for Rectorite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • Victoria
    • Mansfield
      • A1 Mining Settlement
F.Bussat 1980, Minerals from some mines in the Woods Point district, Victoria. The Australian Mineralogist No.31, July 1980, pp. 147-152
    • Shire of Mansfield
      • Gaffney's Creek
F.Bussat 1980. Minerals from some mines in the Woods Point district, Victoria. The Australian Mineralogist No.31 July 1980, pp. 147-152
      • Woods Point
F.Bussat 1980. Minerals from some mines in the Woods Point district, Victoria, The Australian Mineraogist No.31 !980, pp.147-152
F.Bussat 1980. Minerals from some mines in the Woods Point district, Victoria. The Australian Mineralogist No.31 July 1980, pp. 147-152
Austria
 
  • Salzburg
    • Oberndorf
R. Exel: Die Mineralien und Erzlagerstätten Österreichs (1993)
Brazil
 
  • Bahia
    • Boquira (former Macaúbas)
MinRec 6:286
China
 
  • Guangxi Zhuang Autonomous Region
    • Baise Prefecture
Naixian Zhang, Liancheng Wang, Yaxiu Yang, Gengmei Zhao, and Yuguang Ma (1996): Acta Mineralogica Sinica 16(1), 8-13
  • Guizhou Province
    • Bijie Prefecture
      • Dafang Co.
Lin Yang (1991): Guizhou Geology 1991(3), 276-280
  • Hubei Province
    • Jingmen Prefecture
Rongying Zhang, Fangqi Wu, and Daihong Zhang (1987): Acta Mineralogica Sinica 7(2), 113-120
Colombia
Clay Min 32:425 (1997)
Cyprus
 
  • Nicosia District (Lefkoşa District; Lefkosia District)
    • Skouriotissa
Adamides, N. G. (2010). Mafic-dominated volcanogenic sulphide deposits in the Troodos ophiolite, Cyprus Part 1–The deposits of the Solea graben. Applied Earth Science, 119(2), 65-77.
Finland
 
  • Western and Inner Finland Region
    • Alajärvi
Kinnunen, Kari A. 2013. Mikrokiteistä kvartsia, kalsedonia ja zeoliitteja Alajärven Hietakankaan sorakuopista. Mineralia 2/2013 10-15.
France
 
  • Rhône-Alpes
    • Isère
ClayMin 32:89 (1997)
Hungary
 
  • Borsod-Abaúj-Zemplén Co.
    • Zemplén Mts (Tokaj Mts)
      • Mád
Koch: Minerals of Hungary, 1985
Japan
 
  • Honshu Island
    • Chubu Region
      • Nagano Prefecture
Clays and Clay Minerals 45:773 (1997)
  • Kyushu Region
    • Kagoshima Prefecture
Kawano, M. & Tomita, K. (1989) Mineralogical Journal, 14, 351-372.; Kawano, M., & Tomita, K. (1991). Mineralogy and genesis of clays in postmagmatic alteration zones, Makurazaki volcanic area, Kagoshima Prefecture, Japan. Clays and Clay Minerals, 39(6), 597-608.
Russia
 
  • Western-Siberian Region
No reference listed
    • Prepolar Ural
      • Tyumenskaya Oblast'
        • Khanty-Mansi Okrug (Khanty Mansiysk)
          • Saranpaul
Burlakov, J. V. (1995): Dodo: Alpine Klüfte im Polar-Ural. Lapis. 20 (3), 13-26, 35
Slovakia
 
  • Banská Bystrica Region
    • Banská Štiavnica Co.
      • Banská Štiavnica (Schemnitz)
Pauliš,P.,Ďuďa,R.,2002: Nejzajímavejší mineralogická naletište Slovenska. Kuttna,K.Hora, 136p
South Africa
 
  • Free State Province
Minerals of South Africa
Spain
 
  • Castile-La Mancha
    • Ciudad Real
      • Almadén District
        • Almadén
Higueras, P., Oyarzun, R., Lunar, R., Sierra, J., and Parras, J. (1999): Mineralium Deposita 34, 211-214.
UK
 
  • Scotland
    • North West Highlands
      • Isle of Skye
Livingstone, A. (1988): Reyerite, tobermorite, calcian analcime, and bytownite from amygdales in a Skye basalt. Mineralogical Magazine 52, 711-713.
USA
 
  • Arizona
    • Cochise Co.
      • Whetstone Mts
        • Whetstone District
www.caves.org; Hill, C.A. (1999) Mineralogy of Kartchner Caverns, Arizona, Journal of Cave and Karst Studies: 61(2): 73-78; Grant, Raymond W., Richard A. Bideaux & Sidney A. Williams (2006), Minerals Added to the Arizona List 1995 to 2005: 7.
  • Arkansas
    • Garland Co.
      • Marble Township
[www.johnbetts-fineminerals.com]; Dana System of Mineralogy 6th ed.; Rocks & Min.:64:327
    • Perry Co.
      • Hollis
Rocks & Min.:63:115; Miser & Milton(1964).
      • Nimrod
        • Deckard Mountain
Rocks & Min.:63:115; Engel(1952).
    • Pulaski Co.
      • Jeffrey
Newsom, G.(1978): The Jeffrey Quarry. Mineralogical Record 9 (2),75-79; Miser, H.D.,and Milton, C.,1964, Quartz, rectorite, and cookeite from theJeffrey Quarry, North Little Rock, Pulaski Co., Arkansas, Arkansas GeologicalCommission, Bull.21 (in coop. with the U.S.G.S.), Little Rock, Arkansas,29 p.
      • Little Rock
Rocks & Min.: 63:122.
    • Saline Co.
      • Bland
MinRec 17:151
      • Paron
Rocks & Min.:63:122.
Smith, Arthur E. Jr. (1996) Collecting Arkansas Minerals. L. Ream Publishing, Idaho 149p.
Rocks & Min.: 63:122.
  • California
    • El Dorado Co.
      • Salmon Falls District (Flagstaff Hill area)
        • Flagstaff Hill
www.agry.purdue.edu/cjohnston/sourceclays/RAr-1.pdf.
  • Colorado
    • Lake Co.
      • Alicante
        • Buckeye Gulch
Minerals of Colorado (1997) E.B. Eckels
    • San Juan Co.
      • Red Mountain District
Minerals of Colorado (1997) E.B. Eckels
  • Montana
    • Flathead Co.
      • Hog Heaven District (Flathead District)
        • Kofford Ridge
Gobla, M.J. (2012) Montana mineral locality index. Rocks & Minerals, 87, #3, 208-240.
  • Tennessee
    • Grainger Co.
      • Copper Ridge Zinc District
Paris, T.A. (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
    • Smith Co.
      • Central Tennessee Ba-F-Pb-Zn District
        • Carthage
Travis A. Paris (2011) Tennessee mineral locality index. Rocks & Minerals, 86, #4, 300-328.
  • Utah
    • Tooele Co.
      • Oquirrh Mts
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Stansbury Mts
UGMS Bull 117 Minerals and Mineral Localities of Utah
    • Utah Co.
      • Beverly Hills
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Lehi District (Lake Mountain)
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Thorpe Hills
UGMS Bull 117 Minerals and Mineral Localities of Utah
      • Wasatch Mts
UGMS Bull 117 Minerals and Mineral Localities of Utah
Mineral and/or Locality  
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