Cerite-(La) Mineral Data (original) (raw)

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

Click Here for Larger Cerite-(La) Image in a New Browser Window Images:

Click Here for Larger Cerite-(La) Image 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

Click Here for Larger Cerite-(La) Image in a New Browser Window Images:

Click Here for Larger Cerite-(La) Image 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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Help on Above

| | 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 Diaphaneity: Diaphaneity:

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
Ncalc = 1.8 - 1.81

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:

Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Cerite-(La) =4.74 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

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 = 52,941.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Cerite-(La) per GRapi unit = 18.89 (PPM)

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

SpecimenSizeWeight/Volume(Sphere) * CalculatedActivityBecquerels(Bq) CalculatedActivityCuries (Ci) EstimatedActivityGR(api) EstimatedExposure(mRem**)/hrIf Held in HandFor One Hour
1000 gm / 7.39 cm 1,231,087 3.33E-05 52,941.91 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:

52.04.06.02 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.06)Cerite Group

52.04.06.01 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

52.04.06.02 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

52.04.06.03 Aluminocerite-(Ce)! (Ce,REE,Ca)9(Al,Fe)(SiO4)3[SiO3(OH)]4(OH)3 R 3c 3m

Help on Strunz Class: Strunz Class:

09.AG.20 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination

09.AG.20 Cerite-(Ce) Ce9Fe(SiO4)6[(SiO3)(OH)](OH)3 R 3c 3m

09.AG.20 Cerite-(La)! (La,Ce,Ca)9(Mg,Fe)(SiO4)6[SiO3(OH)](OH)3 R 3c 3m

09.AG.20 Aluminocerite-(Ce)! (Ce,REE,Ca)9(Al,Fe)(SiO4)3[SiO3(OH)]4(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 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Print or Cut-and-Paste your Cerite-(La) Specimen Label here :

Cerite-(La)

(La,Ce,Ca)9(Mg,Fe+++)(SiO4)6[SiO3(OH)](OH)3
Dana No: 52.04.06.02 Strunz No: 09.AG.20
Locality:

Notes: