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Sazhinite-(La)

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Formula:
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
System:OrthorhombicColour:Creamy white; colourless ...
Hardness:3
Name:In allusion to its relationship to Sazhinite-(Ce), and its composition, with lanthanum being the dominant rare earth element cation.

Classification of Sazhinite-(La)

IMA status:Approved 2004
Strunz 8th edition ID:8/H.31-20
Nickel-Strunz 10th (pending) edition ID:9.EA.30

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

Type Locality:Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek District, Khomas Region, Namibia
General Appearance of Type Material:Small elongate tabular crystals up to 1 mm long and 0.4 mm wide
Geological Setting of type material:In vesicles within a phonolite, together with other species crystallized from late-stage hydrothermal fluids
Associated Minerals at type locality:
VilliaumiteTuperssuatsiaiteSphaleriteQuartzNatrolite
MicroclineMakatiteKorobitsyniteKanemiteHydroxylapatite
GalenaFluoriteEudialyteApophylliteAnalcime
Aegirine

Physical Properties of Sazhinite-(La)

Lustre:Pearly
Diaphaneity (Transparency):Transparent, Translucent
Colour:Creamy white; colourless in plane-polarized light
Streak:White
Hardness (Mohs):3
Tenacity:Brittle
Cleavage:Distinct/Good
parallel to {010} and {001}

Crystallography of Sazhinite-(La)

Crystal System:Orthorhombic
Class (H-M):mm2 - Pyramidal
Space Group:Pmm2
Cell Parameters:a = 7.415Å, b = 15.515Å, c = 7.164Å
Ratio:a:b:c = 0.478 : 1 : 0.462
Unit Cell Volume:V 824.2 ų
Morphology:Crystals elongated along [001] and flattened on (010), exhibiting the forms {h0l}, {100} and {001}
Twinning:Not observed
X-Ray Powder Diffraction:
d-spacingIntensity
7.42(59)
6.50(48)
5.36(60)
5.26(68)
3.411(100)
3.345(45)
3.252(83)
3.226(45)
Comments:From type description.

Optical Data of Sazhinite-(La)

Type:Biaxial (+)
RI values: nα = 1.522 - 1.526 nβ = 1.526 - 1.530 nγ = 1.542 - 1.546
2V:Measured: 46° , Calculated: 54°
Maximum Birefringence:δ = 0.020

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

Chemical Properties of Sazhinite-(La)

Formula:
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
Simplified for copy/paste:Na3La[Si6O15]·2H2O
Essential elements:H, La, Na, O, Si
All elements listed in formula:H, La, Na, O, Si
Analytical Data:Average composition determined by electron probe microanalysis (EPMA) and secondary ion mass spectrometry (SIMS)
Empirical Formula:
(Na
 
2.87
K
 
0.02
Sr
 
0.01
)
 
=2.90
{La
 
0.41
Ce
 
0.35
Pr
 
0.02
Nd
 
0.04
(Sm,Gd,Dy,Er,Yb)
 
0.01
Th
 
0.09
U
 
0.01
Y
 
0.01
Zr
 
0.01
Ca
 
0.08
Li
 
0.01
}
 
=1.04
(Si
 
5.87
S
 
0.06
B
 
0.01
)(O
 
14.86
F
 
0.14
) · 2H
 
2
O
Common Impurities:Ca,K,REE

Relationship of Sazhinite-(La) to other Species

Structurally related to group(s):
Dalyite Group
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.15Fluorapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Hydroxyapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Fluorapophyllite-(Na)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
Na
 
2
Si
 
14
O
 
29
· 11H
 
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.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

Other Names for Sazhinite-(La)

Synonyms:
IMA2002-042a
Other Languages:
Russian:Сажинит-(La)

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 Sazhinite-(La)

Reference List:

- +
Camara, F., Ottolini, L., Devouard, B., Garvie, L. A. J., Hawthorne, F. C. (2006): Sazhinite-(La), Na3LaSi6O15(H2O)2, a new mineral from the Aris phonolite, Namibia: Description and crystal structure. Mineralogical Magazine 70, 405-418.

Internet Links for Sazhinite-(La)

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  • Localities for Sazhinite-(La)

    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.
    (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
        • La Vallée-du-Richelieu RCM
          • Mont Saint-Hilaire
    HORVÁTH, L., and GAULT, R.G. (1990) The mineralogy of Mont Saint Hilaire. Mineralogical Record, 21, 284-359.
        • 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. HORVÁTH, L. (2010) The minerals of the Saint-Amable sill: an update. MICRONEWS 44(4), 23-28.
    Namibia
     
    • Khomas Region
      • Windhoek District
        • Aris
    Camara, F., Ottolini, L., Devouard, B., Garvie, L. A. J., Hawthorne, F. C. (2006): Sazhinite-(La), Na3LaSi6O15(H2O)2, a new mineral from the Aris phonolite, Namibia: Description and crystal structure. Mineralogical Magazine 70, 405-418.
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