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Magadiite

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Trinity Co., California, USA
© Caltech

Formula:
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
System:MonoclinicHardness:2
This page provides mineralogical data about Magadiite.

Classification of Magadiite

IMA status:Approved
Strunz 8th edition ID:8/H.39-20
Nickel-Strunz 10th (pending) edition ID:9.EA.20

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Dana 8th edition ID:78.7.12.1

78 : Unclassified Silicates
7 :
Hey's CIM Ref.:14.1.5

14 : Silicates not Containing Aluminum
1 : Silicates of the alkali metals
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Type Occurrence of Magadiite

Type Locality:Lake Magadi, South Rift Valley, Rift Valley Province, Kenya
Year of Discovery:1967

Physical Properties of Magadiite

Hardness (Mohs):2

Crystallography of Magadiite

Crystal System:Monoclinic
Cell Parameters:a = 7.25Å, b = 7.25Å, c = 15.69Å
β = 96.8°
Ratio:a:b:c = 1 : 1 : 2.164
Unit Cell Volume:V 818.90 ų (Calculated from Unit Cell)

Optical Data of Magadiite

Type:Biaxial
RI values: nα = 1.470
Maximum Birefringence:δ = 1.470

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:relatively weak

Chemical Properties of Magadiite

Formula:
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
2
O
Essential elements:H, Na, O, Si
All elements listed in formula:H, Na, O, Si
Common Impurities:Ti,Al,Fe,Mn,Mg,Ca,K

Relationship of Magadiite to other Species

Related Minerals - Nickel-Strunz Grouping):
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Apophyllite-(KF)
KCa
 
4
[(F,OH)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
[(OH,F)|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
[F|Si
 
8
O
 
20
] · 8H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
]·3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
·2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
·4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
·4H
 
2
O
9.EA.60Penkvilksite
(Na,Ca)
 
4
(Ti,Zr)
 
2
Si
 
8
O
 
22
·5H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
)·2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
[(OH)
 
6
|AlSi
 
9
O
 
24
] · 3H
 
2
O
9.EA.75Zeravshanite
Cs
 
4
Na
 
2
Zr
 
3
[Si
 
18
O
 
45
](H
 
2
O)
 
2
Related Minerals - Hey's Index Grouping:
14.1.1Natrosilite
Na
 
2
Si
 
2
O
 
5
14.1.2Ertixiite
Na
 
2
Si
 
4
O
 
9
14.1.3Revdite
Na
 
16
Si
 
16
O
 
27
(OH)
 
26
·28H
 
2
O
14.1.4Makatite
Na
 
2
Si
 
4
O
 
8
(OH)
 
2
·4H
 
2
O
14.1.6Kenyaite
Na
 
2
Si
 
22
O
 
41
(OH)
 
8
·6H
 
2
O
14.1.7Grumantite
Na[Si
 
2
O
 
4
(OH)]·H
 
2
O
14.1.8Silinaite
NaLiSi
 
2
O
 
5
·2H
 
2
O

Other Names for Magadiite

Synonyms:
IMA1967-017
German names:
Magadiit
Japanese names:
マガジ石
Spanish names:
Magadiita

Other Information

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

References for Magadiite

Reference List:Bricker, O.P. (1969), Stability constants and Gibbs free energies of formation of magadiite and kenyaite: American Mineralogist: 54: 1026-1033.

Brindley, G.W. (1969), Unit cell of magadiite in air, in vacuo, and under other conditions: American Mineralogist: 54: 1583-1591.

Lagaly, G., K. Beneke & A. Weiss (1975), Magadiite and H-Magadiite 1. Sodium magadiite and some of its derivatives: American Mineralogist: 60: 642-649.

Internet Links for Magadiite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Magadiite details from Handbook of Mineralogy (PDF)
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    Localities for Magadiite

    Hide Locality List
    The 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.
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    (TL) indicates type locality. ? 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.
    Canada
     
    • Québec
      • Rouville Co.
        • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
      • Verchères Co.
        • Varennes & St-Amable
          • Saint-Amable sill
    		Mineralogical Record: 29: 83.
    Chad
     
    • Lake Chad
    Kenya
     
    • Rift Valley Province
      • Gregory Rift
    		G. Périnet, J.J. Tiercelin, C.E. Barton : "Présence de kanémite dans les sédiments récents du lac Bogoria, Rift Gregory, Kenya", Bull. Minéral., 1982, 105, 633-639.
      • South Rift Valley
    		AM 54 (1969), 1583; HB2/2 (1995)
    Namibia
     
    • Khomas Region
      • Windhoek District
        • Windhoek
          • Aris
    		Wartha, R., Palfi, A., Niedermayr, G., Brandstätter, F. and Petersen, O. V. (2001): Der Aris-Phonolith-Komplex und seine Mineralien. In Bahmann, U. and A. (Eds.), Namibia – Zauberwelt edler Steine und Kristalle, Bode-Verlag, Haltern, Germany, pp. 172-179. (in German); [http://www.koeln.netsurf.de/~w.steffens/aris.htm]
    USA
     
    • California
      • Trinity Co.
        • Trinity Center
    		Am Min 60:642-649; www.mineralsocal.org; Am Min 53:2061-2069
    • Oregon
      • Lake Co.
    		Am. Min. 54:1034
    Mineral and/or Locality
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