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Sazhinite-(La)

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Formula:
Na3La[Si6O15] · 2H2O
System:
Orthorhombic
Colour:
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)

Approved 2004
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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First Recorded Occurrence of Sazhinite-(La)

General Appearance of First Recorded Material:
Small elongate tabular crystals up to 1 mm long and 0.4 mm wide
Geological Setting of First Recorded Material:
In vesicles within a phonolite, together with other species crystallized from late-stage hydrothermal fluids

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}

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 Data:
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°
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)

Formula:
Na3La[Si6O15] · 2H2O
Essential elements:
All elements listed in formula:
Analytical Data:
Average composition determined by electron probe microanalysis (EPMA) and secondary ion mass spectrometry (SIMS)
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
Common Impurities:
Ca,K,REE

Relationship of Sazhinite-(La) to other Species

Structurally related to group(s):
9.EA.05CuprorivaiteCaCu[Si4O10]
9.EA.05GillespiteBaFe2+[Si4O10]
9.EA.05EffenbergeriteBaCu[Si4O10]
9.EA.05WesselsiteSrCu[Si4O10]
9.EA.10Ekanite(Ca,Fe2+,Pb)2(Th,U)[Si8O20]
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
9.EA.20MagadiiteNa2Si14O29 · 11H2O
9.EA.25DalyiteK2ZrSi6O15
9.EA.25DavaniteK2TiSi6O15
9.EA.30Sazhinite-(Ce)Na3Ce[Si6O15] · 6H2O
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2O
9.EA.40OkeniteCaSi2O5 · 2H2O
9.EA.45NekoiteCa3Si6O15·7H2O
9.EA.50CavansiteCa(VO)Si4O10 · 4H2O
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2O
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2O
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2O
9.EA.65NabesiteNa2BeSi4O10 · 4H2O
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2O
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2O
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4
9.EA.85PlumbophyllitePb2Si4O10 · H2O

Other Names for Sazhinite-(La)

Name in Other Languages:

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)

Localities for Sazhinite-(La)

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 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
 
  • 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.
Mineral and/or Locality  
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