Sazhinite-(La)
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Formula:
Na3LaSi6O15 · 2H2O
System:
Orthorhombic
Colour:
Creamy white; colourless ...
Lustre:
Pearly
Hardness:
3
Member of:
Name:
In allusion to its relationship to Sazhinite-(Ce), and its composition, with lanthanum being the dominant rare earth element cation.
The La analogue of sazhinite-(Ce).
See also Unnamed (Sazhinite-related mineral I)and Unnamed (Sazhinite-related mineral II).
See also Unnamed (Sazhinite-related mineral I)and Unnamed (Sazhinite-related mineral II).
Classification of Sazhinite-(La)
Approved
Approval Year:
2004
8/H.31-20
9.EA.30
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
Physical Properties of Sazhinite-(La)
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}
parallel to {010} and {001}
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°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Low
Chemical Properties of Sazhinite-(La)
IMA Formula:
Na3LaSi6O15 · 2H2O
Analytical Data:
Average composition determined by electron probe microanalysis (EPMA) and secondary ion mass spectrometry (SIMS)
Common Impurities:
Ca,K,REE
Crystallography of Sazhinite-(La)
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pmm2
Cell Parameters:
a = 7.415 Å, b = 15.515 Å, c = 7.164 Å
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 Data:
| d-spacing | Intensity |
|---|---|
| 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.
Type Occurrence of Sazhinite-(La)
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
Empirical Formula:
(Na2.87K0.02Sr0.01)=2.90{La0.41Ce0.35Pr0.02Nd0.04(Sm,Gd,Dy,Er,Yb)0.01Th0.09U0.01Y0.01Zr0.01Ca0.08Li0.01}=1.04(Si5.87S0.06B0.01)(O14.86F0.14) · 2H2O
Associated Minerals at Type Locality:
Relationship of Sazhinite-(La) to other Species
Member of:
Other Members of Group:
| Dalyite | K2ZrSi6O15 |
| Davanite | K2TiSi6O15 |
| Sazhinite-(Ce) | Na2CeSi6O14•6H2O |
| 9.EA.05 | Cuprorivaite | CaCuSi4O10 |
| 9.EA.05 | Gillespite | BaFe2+Si4O10 |
| 9.EA.05 | Effenbergerite | BaCuSi4O10 |
| 9.EA.05 | Wesselsite | SrCuSi4O10 |
| 9.EA.10 | Ekanite | Ca2ThSi8O20 |
| 9.EA.15 | Fluorapophyllite-(K) | KCa4Si8O20F · 8H2O |
| 9.EA.15 | Hydroxyapophyllite-(K) | KCa4Si8O20(OH,F) · 8H2O |
| 9.EA.15 | Fluorapophyllite-(Na) | NaCa4Si8O20F · 8H2O |
| 9.EA.20 | Magadiite | Na2Si14O29 · 11H2O |
| 9.EA.25 | Dalyite | K2ZrSi6O15 |
| 9.EA.25 | Davanite | K2TiSi6O15 |
| 9.EA.30 | Sazhinite-(Ce) | Na3CeSi6O15 · 2H2O |
| 9.EA.35 | Armstrongite | CaZrSi6O15 · 2H2O |
| 9.EA.40 | Okenite | Ca10Si18O46 · 18H2O |
| 9.EA.45 | Nekoite | Ca3Si6O15 · 7H2O |
| 9.EA.50 | Cavansite | CaV4+OSi4O10 · 4H2O |
| 9.EA.55 | Pentagonite | CaV4+OSi4O10 · 4H2O |
| 9.EA.60 | Penkvilksite | Na4Ti2Si8O22 · 4H2O |
| 9.EA.60 | Tumchaite | Na2ZrSi4O11 · 2H2O |
| 9.EA.65 | Nabesite | Na2BeSi4O10 · 4H2O |
| 9.EA.70 | Ajoite | K3Cu202+Al3Si29O76(OH)16 · 8H2O |
| 9.EA.75 | Zeravshanite | Na2Cs4Zr3Si18O45 · 2H2O |
| 9.EA.80 | Bussyite-(Ce) | (Na,H2O)6(Ce,REE)3Be5MnSi9(O,OH)30F4 |
| 9.EA.85 | Plumbophyllite | Pb2Si4O10 · H2O |
Other Names for Sazhinite-(La)
Name in Other Languages:
Russian:Сажинит-(La)
Other Information
Health Risks:
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)
mindat.org URL:
https://www.mindat.org/min-27499.html
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Please feel free to link to this page.
External Links:
Mineral Dealers:
Localities for Sazhinite-(La)
This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality.
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(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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 | |
| 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., & 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 (TL) | |
| 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. |
Aris Quarries, Aris, Windhoek District, Khomas Region, Namibia