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Cheralite-(Ce) Mineral Data

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General Cheralite-(Ce) Information

Help on Chemical  Formula: Chemical Formula: (Ce,Ca,Th)(P,Si)O4
Help on Composition: Composition: Molecular Weight = 239.85 gm
   Calcium           5.01 %  Ca    7.01 % CaO
   Lanthanum         5.79 %  La    6.79 % La2O3
   Cerium           11.68 %  Ce   13.68 % Ce2O3
   La,Ce,Pr,Nd,Sm,   3.00 %  RE    3.50 % REE2O3
   Thorium          29.02 %  Th   33.02 % ThO2
   Silicon           1.17 %  Si    2.51 % SiO2
   Phosphorus       11.62 %  P    26.63 % P2O5
   Neodymium         6.01 %  Nd    7.01 % Nd2O3
   Oxygen           26.68 %  O
                   ______        ______ 
                   100.00 %      100.17 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Th0.3Ca0.3Ce0.2Nd0.1La0.1REE0.05(PO4)0.9(SiO4)0.1
Help on Environment: Environment: Disseminated in a kaolinitized pegmatite dike. Cheralite-(Ce) (1953) is now regarded as Ca-rich monazite-(Ce).
Help on IMA Status: IMA Status: Discredited IMA 2006 - Valid Species (Pre-IMA) 1953
Help on Locality: Locality: From Kuttankuli (Kuttakuzhi), about 42 km east-southeast of Trivandrum, Kerala State, India. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Chera (Kerala), an ancient Dravidian kingdom predating Travancor (now Kerala State), India.
Help on Synonym: Synonym: Brabantite
  ICSD 81115
  PDF 33-1095

Cheralite-(Ce) Image

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Comments: Brown to tan, massive cheralite-(Ce) showing cleavage traces.
Location: Uranium King Mine, Trent Creek, Encampment Copper District, Sierra Madre Mts., Carbon Co., Wyoming, USA. Scale: Picture size 1.4 cm.
© Paul M. Schumacher

Cheralite-(Ce) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9706:1:0.9297
Help on Cell Dimensions: Cell Dimensions: a = 6.717, b = 6.92, c = 6.434, Z = 4; beta = 103.833° V = 290.39 Den(Calc)= 5.49
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.07(1), 2.86(0.9), 3.26(0.9),

Physical Properties of Cheralite-(Ce)

Help on Cleavage: Cleavage: {010} Distinct, {100} Poor, {001} Parting
Help on Color: Color: {001}, Brown, Light green, Dark green.
Help on Density: Density: 5.3
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Anhedral Grains - Granular minerals without the expression of crystal shapes
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: white

Optical Properties of Cheralite-(Ce)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.109 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1443,KPDmeas= 0.1494,KC= 0.1678
Ncalc = 1.89 - 1.92
Help on Optical Data: Optical Data: Biaxial (+), a=1.779, b=1.78, g=1.817, bire=0.0380, 2V(Calc)=20, 2V(Meas)=17-20.
Help on Pleochroism (x): Pleochroism (x): green.
Help on Pleochroism (y): Pleochroism (y): green.
Help on Pleochroism (z): Pleochroism (z): yellowish green.

Calculated Properties of Cheralite-(Ce)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.70 gm/cc
note: Specific Gravity of Cheralite-(Ce) =5.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PECheralite-(Ce) = 834.18 barns/electron
U=PECheralite-(Ce) x relectron=3,916.93 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 548,540.92 (Gamma Ray American Petroleum Institute Units)
Concentration of Cheralite-(Ce) per GRapi unit =1,823.02 (PPB)

Cheralite-(Ce) 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) 55.45 ± 13.86 grams of pure Cheralite-(Ce) .
Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5545.0 ±1386.3 grams of pure Cheralite-(Ce) .

Estimated Radioactivity from Cheralite-(Ce) - strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.12 cm 13,002,235 3.51E-04 548,540.92 180.34
100 gm / 3.30 cm 1,300,224 3.51E-05 54,854.09 18.03
10 gm / 1.53 cm 130,022 3.51E-06 5,485.41 1.80
1 gm / 7.12 mm 13,002 3.51E-07 548.54 0.18
0.1 gm / 3.30 mm 1,300 3.51E-08 54.85 0.02
0.01 gm / 1.53 mm 130 3.51E-09 5.49 0.00
0.001 gm / 0.71 mm 13 3.51E-10 0.55 0.00

Weight of pure Cheralite-(Ce) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.30 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

Cheralite-(Ce) Classification

Help on  Dana Class: Dana Class: (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.03)Monazite Group (Monoclinic: P21/n) Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m Brabantite? CaTh(PO4)2 P 21 2 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m Gasparite-(Ce) CeAsO4 P 21/n 2/m Monazite-(Sm)! SmPO4 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.XX.00 08 - PHOSPHATES, ARSENATES, VANADATES
  08.XX -Monazite Group
08.XX.00 Arsenobismite? Bi2(AsO4)(OH)3 Unk Ortho
08.XX.00 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8•4-5(H2O) P1 1
08.XX.00 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m
08.XX.00 Chernovite-(Ce)* (Ce,Y)(AsO4) I 41/amd 4/m 2/m 2/m
08.XX.00 Kerstenite? PbSeO4(?) P nma 2/m 2/m 2/m
08.XX.00 Laubmannite? Fe3Fe6(PO4)4(OH)12 Unk Ortho
08.XX.00 Spodiosite? Ca2(PO4)F Pbcm 2/m 2/m 2/m
08.XX.00 Pseudo-autunite* (H3O)4Ca2(UO2)2(PO4)4•5(H2O)(?) Unk Ortho
08.XX.00 Viseite Ca10Al24(SiO4)6(PO4)7O22F3•72(H2O)(?) I a3d 4/m 3 2/m
08.XX.00 Vanuranylite? (H3O,Ba,Ca,K)1.6(UO2)2V2O8•4(H2O)(?) C 2/c ? 2/m
08.XX.00 Sodium-autunite Na2(UO2)2(PO4)2•8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Sodium meta-autunite! Na2(UO2)2(PO4)2•6-8(H2O) P 4/nmm 4/m 2/m 2/m
08.XX.00 Slavkovite! Cu13(AsO4)6(AsO3OH)4•23(H2O) P1 1
08.XX.00 IMA2000-020! Fe4[AsO3OH]5[AsO2(OH)2]2•20(H2O) Ortho Ortho
08.XX.00 Lewisite! (Ca,Fe,Na)2(Sb,Ti)2O7 F d3m 4/m 3 2/m
08.XX.00 Kamarizaite! Fe3(AsO4)2(OH)3•3H2O Pccm, Pcc2, Pcmm, Pcm21 Ortho
08.XX.00 Lapeyreite! Cu3O[AsO3(OH)]2•H2O C 2/m 2/m
08.XX.00 IMA2008-063 Pb[Zn0.25,[]0.75]Fe3H(AsO4)2(OH)6 C 2/c 2/m
08.XX.00 IMA2009-002! Cu3(AsO4)2 P 21/c 2/m
08.XX.00 IMA2009-005 (Y,Ca,REE)5[(Si,P)O4]3F P 63/m 6/m 2/m 2/m
08.XX.00 IMA2009-016 Cu4H(AsO4)2(OH)3•H2O P1 1

Other Cheralite-(Ce) Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Cheralite-(Ce) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (UofA)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info
12 - Scandinavian mineral gallery

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Dana No: Strunz No: 08.XX.00





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