Magadiite (original) (raw)

A valid IMA mineral species

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About MagadiiteHide

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Formula:

Na2Si14O29 · 11H2O

Specific Gravity:

2.25 (Calculated)

Crystal System:

Orthorhombic

Name:

Named for the type locality Lake Magadi.

This page provides mineralogical data about Magadiite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2530:6

f0531c94-04b8-440f-8364-4f273a4dcecd

IMA Classification of MagadiiteHide

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IMA Formula:

Na2Si14O28(OH)2 · 8H2O

Type description reference:

Classification of MagadiiteHide

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9.EA.20

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings

78.7.12.1

78 : Unclassified Silicates
7 :

14.1.5

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol Source Reference
Mgd IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Mgd Warr (2020) Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of MagadiiteHide

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Transparency:

Translucent, Opaque

Comment:

Tenacity: Puttylike

Density:

2.25 g/cm3 (Calculated)

Optical Data of MagadiiteHide

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δ = 1.470

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Dispersion:

relatively weak

Chemistry of MagadiiteHide

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Mindat Formula:

Na2Si14O29 · 11H2O

Common Impurities:

Ti,Al,Fe,Mn,Mg,Ca,K

Crystallography of MagadiiteHide

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Crystal System:

Orthorhombic

Class (H-M):

m _m_2 - Pyramidal

Cell Parameters:

a = 10.5035(9) Å, b = 10.0262(9) Å, c = 61.9608(46) Å

Ratio:

a:b:c = 1.048 : 1 : 6.18

Unit Cell V:

6,525.10 ų (Calculated from Unit Cell)

Morphology:

Putty-like laminae to very thin platy.

Comment:

Space Group: F2dd; Z undetermined

Crystal StructureHide

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ID Species Reference Link Year Locality Pressure (GPa) Temp (K)
0012231 Magadiite Garces J M, Rocke S C, Crowder C E, Hasha D L (1988) Hypothetical structures of magadiite and sodium octosilicate and structural relationships between the layered alkali metal silicates and the mordenite- and pentasil-group zeolites Clays and Clay Minerals 36 409-418 1988 0 293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
15.41 Å (100)
3.44 Å (80)
3.146 Å (50)
3.30 Å (35)
5.18 Å (19)
4.46 Å (18)
5.01 Å (16)

Comments:

Lake Magadi, Kenya. The data are from the type description.

Geological EnvironmentHide

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Type Occurrence of MagadiiteHide

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General Appearance of Type Material:

White putty-like laminae, in beds varying in thickness from 5 cm to 60 cm.

Place of Conservation of Type Material:

National School of Mines, Paris, France.
National Museum of Natural History, Washington, D.C., USA, 121336.

Geological Setting of Type Material:

Evaporite from saline brine.

Associated Minerals at Type Locality:

Reference:

Eugster, H.P. (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert. Science: 157: 1177-1180.

Synonyms of MagadiiteHide

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Other Language Names for MagadiiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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9.EA. Bussyite-(Y) (Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34 Mon. 2 : _B_2
9.EA. Fluorapophyllite-(NH₄) NH4Ca4(Si8O20)F · 8H2O Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/m n c
9.EA. Hydroxymcglassonite-(K) KSr4Si8O20(OH) · 8H2O Tet.
9.EA. Miyawakiite-(Y) ◻Y4Fe2(Si8O20)(CO3)4(H2O)3 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _I_4/m c m
9.EA.05 Cuprorivaite CaCuSi4O10 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/n c c
9.EA.05 Gillespite BaFe2+Si4O10 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/n c c
9.EA.05 Effenbergerite BaCuSi4O10 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/n c c
9.EA.05 Wesselsite SrCuSi4O10 Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/n c c
9.EA.07 Fluorapophyllite-(Cs) CsCa4(Si8O20)F · 8H2O Tet.
9.EA.10 Ekanite Ca2ThSi8O20 Tet. 422 : _I_422
9.EA.15 Fluorapophyllite-(K) KCa4(Si8O20)(F,OH) · 8H2O Tet. 4/m m m _(_4/_m_2/_m_2/m ) : _P_4/m n c
9.EA.15 Hydroxyapophyllite-(K) KCa4(Si8O20)(OH,F) · 8H2O Tet. 4/m m m _(_4/_m_2/_m_2/m )
9.EA.15 Fluorapophyllite-(Na) NaCa4(Si8O20)F · 8H2O Orth.
9.EA.25 Dalyite K2ZrSi6O15 Tric. 1 : _P_1
9.EA.25 Davanite K2TiSi6O15 Tric.
9.EA.30 Sazhinite-(Ce) Na3CeSi6O15 · 2H2O Orth. m _m_2 : P m _m_2
9.EA.30 Sazhinite-(La) Na3La[Si6O15] · 2H2O Orth. m _m_2 : P m _m_2
9.EA.35 Armstrongite CaZr[Si6O15] · 3H2O Mon. 2/m : _B_2/m
9.EA.40 Okenite Ca10Si18O46 · 18H2O Tric. 1 : _P_1
9.EA.45 Nekoite Ca3Si6O15 · 7H2O Tric. 1 : _P_1
9.EA.45 Perettiite-(Y) Y2Mn4FeSi2B8O24 Orth. m m m _(_2/_m_2/_m_2/m ) : P m n a
9.EA.45 Badakhshanite-(Y) Y2Mn4Al(Si2B7BeO24) Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
9.EA.47 Shlykovite KCa[Si4O9(OH)] · 3H2O Mon. 2/m : _P_21/b
9.EA.50 Cavansite Ca(VO)Si4O10 · 4H2O Orth. m m m _(_2/_m_2/_m_2/m )
9.EA.50 Diegogattaite Na2CaCu2Si8O20 · H2O Mon. 2/m : _B_2/m
9.EA.52 Yangite PbMnSi3O8 · H2O Tric. 1 : _P_1
9.EA.55 Pentagonite Ca(VO)Si4O10 · 4H2O Orth. m _m_2
9.EA.60 Penkvilksite Na4Ti2Si8O22 · 4H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n
9.EA.60 Tumchaite Na2Zr(Si4O11) · 2H2O Mon. 2/m : _P_21/b
9.EA.65 Nabesite Na2BeSi4O10 · 4H2O Orth. 222 : _P_212121
9.EA.70 Ajoite (K,Na)Cu7AlSi9O24(OH)6 · 3H2O Tric.
9.EA.75 Zeravshanite Na2Cs4Zr3[Si18O45]*2H2O Mon. 2/m : _B_2/b
9.EA.80 Bussyite-(Ce) (Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4 Mon. 2/m : _B_2/b
9.EA.85 Plumbophyllite Pb2Si4O10 · H2O Orth. m m m _(_2/_m_2/_m_2/m ) : P b c n

Other InformationHide

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Notes:

Magadiite in dilute acid at room temperature produces a hydrous form of silica. Subsequent treatment of the silica with concentrated solutions of Na2CO3 or NaOH produces magadiite again.

Health Risks:

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

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References for MagadiiteHide

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Reference List:

Horváth, László, Gault, Robert A., Tarassoff, Peter, Pfenninger-Horváth, Elsa (1998) Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Quebec. The Mineralogical Record, 29 (2) 83-118

Marler, B., Krysiak, Y., Grosskreuz, I., Gies, H., & Kolb, U. (2022). The crystal structure of mineral magadiite, Na2Si14O28 (OH) 2∙ 8H2O. American Mineralogist, 107(11), 2101-2110.

Localities for MagadiiteHide

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This 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.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Bolivia
Potosí Nor Lípez Province San Juan ⓘ Cachilaguna (Cachi Laguna; Laguna Cachi) Abdelouas et al. (1995)
Canada
Québec Montérégie La Vallée-du-Richelieu RCM Mont Saint-Hilaire ⓘ Poudrette quarry (De-Mix quarry; Demix quarry; Uni-Mix quarry; Carrière Mont Saint-Hilaire; MSH) Grice (1989) +1 other reference
Lajemmerais RCM Varennes & St-Amable ⓘ Saint-Amable sill Horváth et al. (1998)
ⓘ Demix-Varennes quarry Horváth et al. (1998)
Chad
ⓘ Kanem Region Clays and Clay Minerals. Vol. 35
Kenya
Baringo County ⓘ Lake Bogoria (Hannington Lake) Périnet et al. (1982)
Kajiado County ⓘ Lake Magadi (TL) New data on minerals. M.: 2003. Volume ... +3 other references
Namibia
Khomas Region Windhoek Rural Aris ⓘ Aris Quarries ... +1 other reference
Niger
Diffa N'guigmi Department ⓘ N'guigmi Sebag et al. (2001)
Russia
Orenburg Oblast Adamovsky District ⓘ Rechnoye cacholong deposit webmineral.ru (n.d.)
USA
California Inyo County ⓘ Keene Wonder Van Nostrand Reinholt Press: 442 +2 other references
Trinity County Klamath Mountains Trinity Mountains Halls Gulch Mining District Wildcat Peak ⓘ Trinity Mining claim www.mineralsocal.org +7 other references
Oregon Lake County ⓘ Alkali Lake Rooney et al. (1969)