Cerite-(La) Mineral Data


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General Cerite-(La) Information
Help on Chemical Formula: Chemical Formula: (La,Ce,Ca)9(Mg,Fe+++)(SiO4)6[SiO3(OH)](OH)3
Help on Composition: Composition: Molecular Weight = 1,825.93 gm
   Strontium       1.68 %  Sr    1.99 % SrO
   Calcium         3.69 %  Ca    5.16 % CaO
   Lanthanum      32.41 %  La   38.01 % La2O3
   Cerium         20.49 %  Ce   24.00 % Ce2O3
   Praeseodymium   0.54 %  Pr    0.63 % Pr2O3
   Samarium        0.08 %  Sm    0.10 % Sm2O3
   Gadolinium      0.17 %  Gd    0.20 % Gd2O3
   Magnesium       0.31 %  Mg    0.51 % MgO
   Iron            0.98 %  Fe    1.26 % FeO
   Silicon         9.78 %  Si   20.93 % SiO2
   Phosphorus      1.09 %  P     2.49 % P2O5
   Hydrogen        0.36 %  H     3.24 % H2O
   Neodymium       1.26 %  Nd    1.47 % Nd2O3
   Oxygen         27.16 %  O
                 ______        ______ 
                 100.00 %       99.97 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: La4.26Ce2.67Ca1.38Sr0.35Nd0.16Pr0.07Gd0.02Sm0.01Fe2+0.32Ca0.3Mg0.23(SiO4)34(Si0.84) 4(P0.16)4(O3.11)4(OH)(OH)2.56
Help on Environment: Environment: Late-stage, low-temperature, secondary phase in a zoned aegirine-natrolite vein that cuts foyaite.
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Mt. Yuksporr, Khibina massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the La dominant analog of cerite-(Ce).
Help on Synonym: Synonym: IMA2001-042
 

Cerite-(La) Image

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Cerite-(La)

Comments: Orange aggregates of cerite-(La) in matrix, (CanMin, 40:1179).
Location: Mt. Yuksporr, Khibina massif, Kola Peninsula, Russia. Scale: Specimen size 3.5 cm.
© Canadian Mineralogist
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Cerite-(La)

Comments: SEM photomicrograph of a rhombohedral crystal of cerite-(La).
Location: Mt. Yuksporr, Khibina massif, Kola Peninsula, Russia. Scale: Crystal size 2 mm.
© Canadian Mineralogist

Cerite-(La) Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:3.56469
Help on Cell Dimensions: Cell Dimensions: a = 10.7493, c = 38.318, Z = 6; V = 3,834.37 Den(Calc)= 4.74
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.958(1)(0.2.10), 3.47(0.4)(122), 3.31(0.38)(214),2.833(0.37)(128), 1.949(0.34)(238,1.3.13), 2.689(0.34)(220), 3.53(0.26)(1.0.10), 3.1(0.25)(300), 2.79(0.24)(306),
Click Here for Large Cerite-(La) Structure Window Crystal Structure:

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Pakhomovsky Y A , Men shikov Y P , Yakovenchuk V N , Ivanyuk G Y , Krivovichev S V , Burns P C , The Canadian Mineralogist , 40 (2002) p.1177-1184, Cerite-(La), (La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3[SiO3(OH)]4(OH)3, a new mineral, from the Khibiny Alkaline Massif: Occurrence and crystal structure, Locality: Khibina alkaline massif, Kola Peninsula, Russia

 

Physical Properties of Cerite-(La)

Help on Cleavage: Cleavage: None
Help on Color: Color: Light yellow, Pinkish brown.
Help on Density: Density: 4.7
Help on Diaphaniety: Diaphaniety: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Equant Grains - Granular material with equel dimensions in x, y, and z.
Help on Habit: Habit: Rhombohedral Crystals - Occurs as well-formed crystals showing rhobohedral crystals.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Cerite-(La)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.01 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1719,KPDmeas= 0.1734,KC= 0.1703
Help on Optical Data: Optical Data: Uniaxial (+), w=1.81, e=1.82, bire=0.0100.
 

Calculated Properties of Cerite-(La)

Help on Electron Density: Electron Density:

relectron=4.28 gm/cc
note: rCerite-(La) =4.74 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01075
Boson Index = 0.98925
Help on Photoelectric: Photoelectric:

PECerite-(La) = 274.35 barns/electron
U=PECerite-(La) x relectron=1,174.39 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 52,941.89 (Gamma Ray American Petroleum Institute Units)

Cerite-(La) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram.

Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 574.53 ±143.63 grams of pure Cerite-(La) .

Estimated Radioactivity from Cerite-(La) - weak
Specimen
Size
Weight/Volume
(Sphere) *		 Calculated
Activity
Bequerols
(Bq)		 Calculated
Activity
Curies (Ci)		 Estimated
Activity
GR(api)		 Estimated
Exposure
(mRem**)/hr
If Held in Hand
For One Hour
1000 gm / 7.39 cm 1,231,087 3.33E-05 52,941.89 17.41
100 gm / 3.43 cm 123,109 3.33E-06 5,294.19 1.74
10 gm / 1.59 cm 12,311 3.33E-07 529.42 0.17
1 gm / 7.39 mm 1,231 3.33E-08 52.94 0.02
0.1 gm / 3.43 mm 123 3.33E-09 5.29 0.00
0.01 gm / 1.59 mm 12 3.33E-10 0.53 0.00
0.001 gm / 0.74 mm 1 3.33E-11 0.05 0.00

Weight of pure Cerite-(La) in grams (gm) and Calculated Diameter of a Sphere with a Density of 4.74 gm/cc.*
Goverment Estimate of Average Annual Exposure ( 360 mRem) **
Note: 10 microsieverts/hr = 1 mRem/hr **
Max Permissable Adult Dose 50,000 mRem/yr (hands), 15,000 mRem/yr (eyes)
Lethal Dose LD(50) Exposure 400,000 to 500,000 mRem
Estimated Thorium Activity ( 2.75 % Th) From Sum REE Elements (54.95 % REE)
 

Cerite-(La) Classification
Help on Dana Class: Dana Class: 52.4.6.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.4)with cations in [6] and/or > [6] coordination
  (52.4.6)Dana Group
 
52.4.6.1 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m
 
52.4.6.2 Cerite-(La) ! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m
Help on Strunz Class: Strunz Class: VIII/B.19-50 VIII - Silicates
  VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]
  VIII/B.19 - Kuliokite-(Y) - Cerite-(Ce) series
 
VIII/B.19-10 Kuliokite-(Y) (Y,REE)4Al(SiO4)2(OH)2F5 P1 1
 
VIII/B.19-20 Tornebohmite-(Ce) (Ce,La,Nd)2Al(SiO4)2(OH) P 21/c 2/m
 
VIII/B.19-30 Tornebohmite-(La) (La,Ce)2Al(SiO4)2(OH) P 21/c 2/m
 
VIII/B.19-40 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m
 
VIII/B.19-50 Cerite-(La) (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m
 

Other Cerite-(La) Information
Help on References: References: NAME( AmMin, 88:1175) PHYS. PROP.(AmMin, 88:1175) OPTIC PROP.(AmMin, 88:1175)
Help on See Also: See Also: Links to other databases for Cerite-(La) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

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Cerite-(La)

(La,Ce,Ca)9(Mg,Fe+++)(SiO4)6[SiO3(OH)](OH)3
Dana No: 52.4.6.2 Strunz No: VIII/B.19-50
Locality:

 

Notes:

 
 
   
 
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