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Magadiite

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Trinity Co., California, USA
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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
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
(Si
 
8
O
 
20
)F · 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
 
4
Ti
 
2
Si
 
8
O
 
22
 · 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
 · 4H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
 · 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4
9.EA.85Plumbophyllite
Pb
 
2
Si
 
4
O
 
10
 · H
 
2
O
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(HSi
 
2
O
 
5
) · H
 
2
O
14.1.8Silinaite
NaLiSi
 
2
O
 
5
 · 2H
 
2
O

Other Names for Magadiite

Synonyms:
IMA1967-017
Other Languages:
German:Magadiit
Japanese:マガジ石
Spanish: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:

- +
Eugster H P (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert, Science, 157, 1177-1180
McAtee J L, House R, Eugster H P (1968) Magadiite from Trinity County, California, American Mineralogist, 53, 2061-2069
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.
HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284 359.
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.

Internet Links for Magadiite

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    • Localities for Magadiite

    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.
    Hide Locality List
    (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
      • Montérégie
        • Lajemmerais RCM
          • Varennes & St-Amable
            • Saint-Amable sill
    		Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
        • Rouville RCM
          • Mont Saint-Hilaire
    		Horváth, L and Gault, R.A. (1990), The mineralogy of Mont Saint-Hilaire Quebec. Mineralogical Record: 21: 284-359.
    Chad
     
    • Lake Chad
    		Clays and Clay Minerals. Vol. 35, No. 4, 318-320, 1987.
    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); New data on minerals. M.: 2003. Volume 38 pp113
    Namibia
     
    • Khomas Region
      • Windhoek District
        • 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
      • Inyo Co.
    		Bricker, O.P. (1969), Stability constants and Gibbs free energies of formation of magadiite and kenyaite: American Mineralogist: 54: 1032-1033; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 442.
      • Trinity Co.
        • Klamath Mts
          • Trinity Mts
            • Halls Gulch District
              • Wildcat Peak
    		Eugster, H.P., F.J. Blair, and R.A. Sheppard (1967) New hydrous sodium silicates from Kenya, Oregon and California. Geological Society of America Abstract with Program, 60.; McAtee, J.L., House, R., and Eugster, H.P. (1968) Magadiite from Trinity County, California. American Mineralogist: 53: 2061-2069; Barnes, I., J.B. Rapp & J.R. O’Neil (1972), Metamorphic assemblages and the direction of flow of metamorphic fluids in four instances of serpentinization: Contributions to Mineralogy and Petrology: 35: 264; Gude, A.J. and Sheppard, R.A. (1972) Silhydrite, 3SiO2 •H2O, a new mineral from Trinity County, California. American Mineralogist: 57: 1053-1065; American Mineralogist (1975): 60: 642-649; www.mineralsocal.org.
    • Oregon
      • Lake Co.
    		Am. Min. 54:1034
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