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Cerite-(La)

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Formula:
(La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3(HSiO4)4(OH)3
System:
Trigonal
Colour:
Light yellow to ...
Hardness:
5
Member of:
Name:
La-dominant Cerite
Isostructural with:
The lanthanum and iron analogue of Cerite-(Ce). Isostructural with phosphates of Whitlockite group.

Classification of Cerite-(La)

Approved 2001
9.AG.20

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
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Type Occurrence of Cerite-(La)

General Appearance of Type Material:
Porous pseudomorphs up to 7cm long after unidentified hexagonal prismatic mineral (Belovite-(Ce) ?). Framework-like aggregates of crystals up to 2mm within these pseudomorphs.
Year of Discovery:
2001
Geological Setting of Type Material:
In an aegirine-natrolite-microcline vein in foyaite.

Physical Properties of Cerite-(La)

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Light yellow to pinkish-brown
Streak:
White
Hardness (Mohs):
5
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
4.7 g/cm3 (Measured)    4.75 g/cm3 (Calculated)

Crystallography of Cerite-(La)

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Cell Parameters:
a = 10.7493Å, c = 38.318Å
Ratio:
a:c = 1 : 3.565
Unit Cell Volume:
V 3834.4 ų
Z:
6
Morphology:
{102} and {001}, habit equant to tabular on {001}.
Twinning:
None mentioned.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.53 (26)
3.47 (40)
3.31 (38)
3.10 (25)
2.958 (100)
2.833 (37)
2.790 (24)
2.689 (34)
1.949 (34)

Optical Data of Cerite-(La)

Type:
Uniaxial (+)
RI values:
nω = 1.810 nε = 1.820
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Pleochroism:
Non-pleochroic

Chemical Properties of Cerite-(La)

Formula:
(La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3(HSiO4)4(OH)3
Essential elements:
All elements listed in formula:
Analytical Data:
Means of 42 to 70 sets of electron microprobe data (with H2O by Penfield method)
MgO (0.51)
CaO (5.09)
SrO (1.97)
Fe2O3 (1.40)
La2O3 (37.57)
Ce2O3 (23.67)
Pr2O3 (0.61)
Nd2O3 (1.48)
Sm2O3 (0.10)
Gd2O3 (0.24)
SiO2 (22.38)
P2O5 (0.63)
H2O (3.20)

Total: 98.85 wt.%
Empirical Formula:
(La4.26Ce2.67Ca1.38Sr0.35Nd0.16Pr0.07Gd0.02Sm0.01)Σ8.92(Fe0.32Ca0.30Mg0.23)Σ0.85(SiO4)3.00[(Si0.84P0.16)Σ1.00O3.11(OH)]4(OH)2.56

Relationship of Cerite-(La) to other Species

Member of:
Other Members of Group:
Aluminocerite-(Ce)(Ce,La,Ca)9(Al,Fe3+)(SiO4)3(HSiO4)4(OH)3
Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
9.AG.05AbswurmbachiteCuMn63+(SiO4)O8
9.AG.05BrauniteMn2+Mn63+(SiO4)O8
9.AG.05NeltneriteCaMn63+(SiO4)O8
9.AG.05Braunite-IICaMn143+(SiO4)O20
9.AG.10Långbanite(Mn2+,Ca)4(Mn3+,Fe3+)9Sb5+(SiO4)2O16
9.AG.15MalayaiteCaSn(SiO4)O
9.AG.15TitaniteCaTi(SiO4)O
9.AG.15VanadomalayaiteCaV4+(SiO4)O
9.AG.15Natrotitanite(Na0.5Y0.5)Ti(SiO4)O
9.AG.20Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3
9.AG.20Aluminocerite-(Ce)(Ce,La,Ca)9(Al,Fe3+)(SiO4)3(HSiO4)4(OH)3
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5
9.AG.25Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2O
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2O
9.AG.40aNatisiteNa2Ti(SiO4)O
9.AG.40bParanatisiteNa2Ti(SiO4)O
9.AG.45Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)
9.AG.45Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5
9.AG.55ChantaliteCaAl2(SiO4)(OH)4
9.AG.60MozartiteCaMn3+(SiO4)(OH)
9.AG.60VuagnatiteCaAl(SiO4)(OH)
9.AG.65HatruriteCa3(SiO4)O
9.AG.70JasmunditeCa11(SiO4)4O2S
9.AG.75AfwilliteCa3(HSiO4)2 · 2H2O
9.AG.80BultfonteiniteCa2(HSiO4)F · H2O
9.AG.85ZoltaiiteBaV24+V123+(SiO4)2O19
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O4

Other Names for Cerite-(La)

Name in Other Languages:
Simplified Chinese:镧硅铈石
Traditional Chinese:鑭矽鈰石

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 Cerite-(La)

Reference List:
Canadian Mineralogist: 40: 1177-1184.

Internet Links for Cerite-(La)

Localities for Cerite-(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.
Madagascar
 
  • Antsiranana Province
    • Diana Region (Northern Region)
      • Ambanja District
        • Ampasindava Peninsula
G. Estrade/University of Toulouse personal communication to W.Hampel, 2011
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
CanMin 40: 1177-1184
Pekov I.V. (2007) New minerals from former Soviet Union countries 1998-2006, - Mineralogical Almanac, v.11, p. 15.
Mineral and/or Locality  
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