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Cerite-(La)

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Big Photo

Hackman Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Pavel M. Kartashov




Formula:
(La,Ce,Ca)
 
9
(Fe,Ca,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
System:TrigonalColour:Light yellow to ...
Hardness:5
Name:La-dominant Cerite


Cerite Group.
The lanthanum analogue of Cerite-(Ce).

Classification of Cerite-(La)

IMA status:Approved 2001
Nickel-Strunz 10th (pending) edition ID: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)

Co-type Localities:Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
Hackman Valley, Yukspor Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
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.
Associated Minerals at type locality:
VanadiniteStrontianiteSphaleriteNatroliteMicrocline
IlmeniteGalenaFluorapatiteEdingtoniteChabazite-Ca
Cerite-(Ce)CatapleiiteBaryliteAncylite-(Ce)Anatase
Aegirine

Physical Properties of Cerite-(La)

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

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:
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
Maximum Birefringence:δ = 0.010

Chart 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)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
Essential elements:Fe, H, La, O, Si
All elements listed in formula:Ca, Ce, Fe, H, La, Mg, O, Si
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:
(La
 
4.26
Ce
 
2.67
Ca
 
1.38
Sr
 
0.35
Nd
 
0.16
Pr
 
0.07
Gd
 
0.02
Sm
 
0.01
)
 
Σ8.92
(Fe
 
0.32
Ca
 
0.30
Mg
 
0.23
)
 
Σ0.85
(SiO
 
4
)
 
3.00
[(Si
 
0.84
P
 
0.16
)
 
Σ1.00
O
 
3.11
(OH)]
 
4
(OH)
 
2.56

Relationship of Cerite-(La) to other Species

Structurally related to group(s):
Cerite Group
Related Minerals - Nickel-Strunz Grouping):

- +
9.AG.05Abswurmbachite
CuMn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Braunite
Mn
2+
 
Mn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Neltnerite
CaMn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Braunite-II
CaMn
3+
14
(SiO
 
4
)O
 
20
9.AG.10Långbanite
(Mn
2+
 
,Ca)
 
4
(Mn
3+
 
,Fe
3+
 
)
 
9
Sb
5+
 
(SiO
 
4
)
 
2
O
 
16
9.AG.15Malayaite
CaSn(SiO
 
4
)O
9.AG.15Titanite
CaTi(SiO
 
4
)O
9.AG.15Vanadomalayaite
CaV
4+
 
(SiO
 
4
)O
9.AG.20Cerite-(Ce)
(Ce,Ca)
 
9
(Fe,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.20Aluminocerite-(Ce)
(Ce,La,Ca)
 
9
(Al,Fe
3+
 
)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.25Trimounsite-(Y)
Y
 
2
Ti
 
2
(SiO
 
4
)O
 
5
9.AG.25Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)(SiO
 
4
)
 
2
O(F,OH)
 
6
9.AG.30Sitinakite
KNa
 
2
Ti
 
4
(SiO
 
4
)
 
2
O
 
5
(OH) · 4H
 
2
O
9.AG.35Kittatinnyite
Ca
 
2
Mn
 
2
Mn(SiO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
9.AG.40aNatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.40bParanatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.45Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
(OH)
9.AG.45Törnebohmite-(La)
(La,Ce)
 
2
Al(SiO
 
4
)
 
2
(OH)
9.AG.50Kuliokite-(Y)
Y
 
4
Al(SiO
 
4
)
 
2
(OH)
 
2
F
 
5
9.AG.55Chantalite
CaAl
 
2
(SiO
 
4
)(OH)
 
4
9.AG.60Mozartite
CaMn
3+
 
(SiO
 
4
)(OH)
9.AG.60Vuagnatite
CaAl(SiO
 
4
)(OH)
9.AG.65Hatrurite
Ca
 
3
(SiO
 
4
)O
9.AG.70Jasmundite
Ca
 
11
(SiO
 
4
)
 
4
O
 
2
S
9.AG.75Afwillite
Ca
 
3
(HSiO
 
4
)
 
2
 · 2H
 
2
O
9.AG.80Bultfonteinite
Ca
 
2
(HSiO
 
4
)F · H
 
2
O
9.AG.85Zoltaiite
BaV
4+
2
V
3+
12
(SiO
 
4
)
 
2
O
 
19
9.AG.90Tranquillityite
(Fe
2+
 
,Ca)
 
8
(Zr,Y)
 
2
Ti
 
3
(SiO
 
4
)
 
3
O
 
4

Other Names for Cerite-(La)

Synonyms:
IMA2001-042
Other Languages:
Russian:Церит-(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 Cerite-(La)

Reference List:

- +
Canadian Mineralogist: 40: 1177-1184.

Internet Links for Cerite-(La)

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    • Localities for Cerite-(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.
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    (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.
    Russia
     
    • 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.
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