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Rectorite

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Rectorit (SNr: B000107)

von Allevard, Bourg d'Oisans, Grenoble, Isère, Rhône-Alpes, Frankreich; Rectorit, beigefarben, filzig-lederig; BB = 40 mm

Collection:

Lithothek der Münchener Micromounter

Hannes Osterhammer

Contribution: Münchener Micromounter 2016-03-28

Locality: Allevard / Haut-Grésivaudan, Kanton / Grenoble, Arrondissement / Isère, Département / Auvergne-Rhône-Alpes, Region / Frankreich

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Rectorit

Rectorit; Allevard,Grenoble,Frankreich; BB: 3 cm

Collection:

Rockhounder

Contribution: Rockhounder 2019-04-06

Locality: Allevard / Haut-Grésivaudan, Kanton / Grenoble, Arrondissement / Isère, Département / Auvergne-Rhône-Alpes, Region / Frankreich

Collectors Summary

Color

weiß

Streak color

weiß

Hardness (Mohs)

1.00 - 2.00

Crystal System

monoklin,

Additional information / Summary

Rectorit ist eine regelmäßige Wechsellagerung ("a 1:1 regular interstratification") aus Montmorillonit und Paragonit - daher als eigenes Mineral anerkannt

Chemism

Chemical formula

(Na,Ca)Al₄(Si,Al)₈O₂₀(OH)₄·2H₂O

Chemical composition

Aluminium, Calcium, Natrium, Silicium, Sauerstoff, Wasserstoff

Unit weight: 781.71309285 u; Number of atoms in the formula: 47

Info

Empirical formula:

(Na_0.75Ca_0.25)Al₄(Si_0.75Al_0.25)₈O₂₀(OH)₄·2H₂O

Element	Symbol	Weight%	Atoms	Atoms%	Atom weight (u)	Sum weight (u)
Hydrogen	H	1.03	8	17.02	1.0079470	8.0635760
Oxygen	O	53.21	26	55.32	15.9994300	415.9851800
Sodium	Na	2.21	0.75	1.60	22.9897702	17.2423277
Aluminium	Al	20.71	6	12.77	26.9815382	161.8892292
Silicon	Si	21.56	6	12.77	28.0855300	168.5131800
Calcium	Ca	1.28	0.25	0.53	40.0784000	10.0196000

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Analysis wt%

SiO₂ : 54.02, Al₂O₃ : 32.74, Na₂O : 3.98, H₂O : 9.26 (Ref: berechnet)

Strunz 9th edition incl. updates

9.EC.60

9: Silikate (Germanate)
E: Schichtsilikate (Phyllosilikate)
C: Schichtsilikate (Phyllosilikate) mit Glimmer Tafeln, zusammengesetzt aus tetrahedralen oder octahedralen Netzen
60:Corrensit-Gruppe

Lapis Classification

VIII/H.18-030

VIII: SILIKATE
H: Schichtsilikate
18: Tonminerale, regulär geschichtet; Montmorillonit-Gruppe

Classification by Hölzel

9.EH.140

9: SILICATES
E: Phyllosilicates
H: Interstratificated Micas
1: Monoclinic Rectorite-Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color	weiß
Streak color	weiß
2V angle	Biaxial

Crystallography

Crystal System	monoklin
Cell parameters a (Å)	5.13
Cell parameters b (Å)	8.88
Cell parameters c (Å)	23.85
Cell parameters a/b or c/a	0.578
Cell parameters c/b	2.686
Cell parameters α	90°
Cell parameters β	96.30
Cell parameters γ	90°
Z	2
Volumne (Å³)	1079.911
X-Ray Powder Diffraction	23.8(100), 11.9(60), 4.75(10), 3.40(20), 2.971(20), 1.970(10)
	Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Physical Properties

Hardness (Mohs)	1.00 - 2.00
VHN (Hardness Vickers)	18 (ungefähre Angabe abgeleitet aus der Mohshärte)
Density (g/cm³)	2.33 (berechnet)
	2.404 ( ρ calc. Mineralienatlas )

(Co-)Type locality

USA /Arkansas /Garland Co./Marble Township /Blue Mountain District

Preface

Author (Name, Year)

Brackett & Williams, 1891

References

Dana's New Mineralogy, (Gaines et. al.), 8th edition, (1997), 1515

Related minerals "Strunz Classification" (9. Edition) [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Dozyite	Mg₇(Al,Fe³⁺,Cr)₂[(OH)₁₂\|Al₂Si₄O₁₅] monoklin : m : Cm	9.EC.60
Kulkeite	Na_0.35Mg₈Al(AlSi₇)O₂₀(OH)₁₀ monoklin	9.EC.60
Tosudite	Na_0.5(Al,Mg)₆(Si,Al)₈O₁₈(OH)₁₂·5H₂O orthorhombisch	9.EC.60
Aliettite	Ca_0.2Mg₆(Si,Al)₈O₂₀(OH)₄·4H₂O hexagonal	9.EC.60
Rectorite	(Na,Ca)Al₄(Si,Al)₈O₂₀(OH)₄·2H₂O monoklin	9.EC.60
Saliotite	Na_0.5Li_0.5Al₃[(OH)₅\|AlSi₃O₁₀] monoklin : 2/m : C2/m	9.EC.60
Corrensite	(Ca,Na,K)(Mg,Fe,Al)₉(Si,Al)₈O₂₀(OH)₁₀·nH₂O orthorhombisch	9.EC.60
'Karpinskite'	(Mg,Ni)₂Si₂O₅(OH)₂	9.EC.60
Hydrobiotite	K(Mg,Fe²⁺)₆(Si,Al)₈O₂₀(OH)₄·nH₂O monoklin : 2/m : C2/m	9.EC.60
Cortesognoite	CaV₂Si₂O₇(OH)₂·H₂O orthorhombisch : mmm : Cmcm	9.EC.60
Lunijianlaite	Li_0.7Al_6.2(Si₇AlO₂₀)(OH,O)₁₀ monoklin	9.EC.60
Brinrobertsite	(Na,K,Ca)_0.3(Al,Fe,Mg)₄(Si,Al)₈O₂₀(OH)₄·3.5H₂O monoklin	9.EC.60

Related minerals "Lapis Classification" [Mineral | Chemical formula | Crystal system : Class (H-M) : Space Group | Indenture number]

Lunijianlaite	Li_0.7Al_6.2(Si₇AlO₂₀)(OH,O)₁₀ monoklin	VIII/H.18-005
Saliotite	Na_0.5Li_0.5Al₃[(OH)₅\|AlSi₃O₁₀] monoklin : 2/m : C2/m	VIII/H.18-007
Kulkeite	Na_0.35Mg₈Al(AlSi₇)O₂₀(OH)₁₀ monoklin	VIII/H.18-010
Aliettite	Ca_0.2Mg₆(Si,Al)₈O₂₀(OH)₄·4H₂O hexagonal	VIII/H.18-020
Rectorite	(Na,Ca)Al₄(Si,Al)₈O₂₀(OH)₄·2H₂O monoklin	VIII/H.18-030
'Tarasovite'	(Na,K,H₃O,Ca)₂Al₄[(OH)₂\|(Si,Al)₄O₁₀]₂·H₂O	VIII/H.18-040
Tosudite	Na_0.5(Al,Mg)₆(Si,Al)₈O₁₈(OH)₁₂·5H₂O orthorhombisch	VIII/H.18-050
Corrensite	(Ca,Na,K)(Mg,Fe,Al)₉(Si,Al)₈O₂₀(OH)₁₀·nH₂O orthorhombisch	VIII/H.18-060

Related minerals "Hoelzel Classification" [Mineral | Chemical formula : Crystal system : Class (H-M) | Space Group | Indenture number]

Lunijianlaite	Li_0.7Al_6.2(Si₇AlO₂₀)(OH,O)₁₀ monoklin	9.EH.100
Dozyite	Mg₇(Al,Fe³⁺,Cr)₂[(OH)₁₂\|Al₂Si₄O₁₅] monoklin : m : Cm	9.EH.110
Kulkeite	Na_0.35Mg₈Al(AlSi₇)O₂₀(OH)₁₀ monoklin	9.EH.130
Rectorite	(Na,Ca)Al₄(Si,Al)₈O₂₀(OH)₄·2H₂O monoklin	9.EH.140
Saliotite	Na_0.5Li_0.5Al₃[(OH)₅\|AlSi₃O₁₀] monoklin : 2/m : C2/m	9.EH.150
Aliettite	Ca_0.2Mg₆(Si,Al)₈O₂₀(OH)₄·4H₂O hexagonal	9.EH.170
Tosudite	Na_0.5(Al,Mg)₆(Si,Al)₈O₁₈(OH)₁₂·5H₂O orthorhombisch	9.EH.180

Other languages

German	Rectorit
Spanish	Rectorita
English	Rectorite
French	Rectorite
Russian	Ректорит

Automatic Links to external internet sources (Responsibility is with the operator)

German pages	DeWikiPedia - search for: Rectorit Google-Bilder-Suche - search for: Rectorit Mineralogisch-Petrographisches-Institut Hamburg - search for: Rectorit
English pages	Mindat - search for: Rectorite Webmineral - search for:Rectorite Handbook-of-Mineralogy - search for: Rectorite RRUFF - Raman, XRD and other mineral data - search for: Rectorite RRUFF - References and PDF downloads - search for: Rectorite American-Mineralogist-Crystal-Structure-Database - search for: Rectorite Athena - search for: Rectorite
Russian pages	Webmineral.ru - search for: Ректорит

Mineral Dealer

German pages

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Crystal-Treasure.com - search for: Rectorit
Bosse - search for: Rectorit

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