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Sazhinite-(La)

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Aris Quarries (Ariskop Quarry; Railway Quarry), Aris, Windhoek, Windhoek District, Khomas Region, Namibia
© Leon Hupperichs

Show Sazhinite-(La) Photos (4)
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.


Dalyite Group.
The La analogue of sazhinite-(Ce).

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, 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
MicroclineMakatiteKorobitsyniteKanemiteGalena
FluoriteEudialyteApophylliteApatite-(CaOH)Analcime
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)
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
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
Member of Group:
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.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.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
·3H
 
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
 * 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
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.
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