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Monazite-(Nd) Mineral Data

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General Monazite-(Nd) Information

Help on Chemical  Formula: Chemical Formula: (Nd,Ce,La)(P,Si)O4
Help on Composition: Composition: Molecular Weight = 240.72 gm
   Lanthanum   14.43 %  La   16.92 % La2O3
   Cerium      11.64 %  Ce   13.64 % Ce2O3
   Thorium      4.82 %  Th    5.48 % ThO2
   Silicon      2.92 %  Si    6.24 % SiO2
   Phosphorus   9.65 %  P    22.11 % P2O5
   Neodymium   29.96 %  Nd   34.94 % Nd2O3
   Oxygen      26.59 %  O
              ______        ______ 
              100.00 %       99.34 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Nd0.5La0.25Ce0.2Th0.05(PO4)0.75(SiO4)0.25
Help on Environment: Environment: Granitic pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Mars Hill, Madison County, North Carolina. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek monazeis - "to be alone" in allusion to its isolated crystals and their rarity when first found.
Help on Name Pronunciation: Name Pronunciation: Monazite-(Nd) Say MONAZITE-(ND)
Help on Synonym: Synonym: ICSD 79750
  PDF 46-1392
 

Monazite-(Nd) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9686:1:0.9215
Help on Cell Dimensions: Cell Dimensions: a = 6.79, b = 7.01, c = 6.46, Z = 4; beta = 103.633° V = 298.82 Den(Calc)= 5.35
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): 3.08(1), 3.28(0.6), 2.846(0.5),
Help on Forms: Forms:

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Drag1 - Manipulate Crystal
Drag2 - Resize

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Help on Above

Forms: ( 0 2 1) ( 0 1 0) ( 1 1 1) ( 1 0 1) ( 1 1 0) ( 1 0 0) ( 1 0 1)

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Physical Properties of Monazite-(Nd)

Help on Cleavage: Cleavage: {001} Distinct, {100} Indistinct
Help on Color: Color: Brown, Red, Yellow, Orange.
Help on Density: Density: 4.8 - 5.5, Average = 5.15
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Habit: Habit: Twinning Common - Crystals are usually twinned.
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Adamantine - Resinous
Help on Streak: Streak: grayish white
 

Optical Properties of Monazite-(Nd)

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.006 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1502,KPDmeas= 0.1561,KC= 0.1552
Ncalc = 1.74 - 1.85
Help on Optical Data: Optical Data: Biaxial (+), a=1.77-1.8, b=1.7705-1.802, g=1.83-1.85, bire=0.0500-0.0600
 

Calculated Properties of Monazite-(Nd)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.58 gm/cc
note: Specific Gravity of Monazite-(Nd) =5.15 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEMonazite-(Nd) = 421.14 barns/electron
U=PEMonazite-(Nd) x relectron=1,929.92 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 91,491.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Monazite-(Nd) per GRapi unit = 10.93 (PPM)

Monazite-(Nd) 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) 332.45 ± 83.11 grams of pure Monazite-(Nd) .

Estimated Radioactivity from Monazite-(Nd) - 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 / 7.18 cm 2,159,206 5.84E-05 91,491.56 30.08
100 gm / 3.33 cm 215,921 5.84E-06 9,149.16 3.01
10 gm / 1.55 cm 21,592 5.84E-07 914.92 0.30
1 gm / 7.18 mm 2,159 5.84E-08 91.49 0.03
0.1 gm / 3.33 mm 216 5.84E-09 9.15 0.00
0.01 gm / 1.55 mm 22 5.84E-10 0.91 0.00
0.001 gm / 0.72 mm 2 5.84E-11 0.09 0.00

Weight of pure Monazite-(Nd) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.15 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
 

Monazite-(Nd) Classification

Help on  Dana Class: Dana Class: 38.04.03.05 (38)Anhydrous Phosphates, etc
  (38.04)A+ XO4
  (38.04.03)Monazite Group (Monoclinic: P21/n)
 
38.04.03.01 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m
 
38.04.03.02 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m
 
38.04.03.03 Cheralite-(Ce)? (Ce,Ca,Th)(P,Si)O4 P 21/n 2/m
 
38.04.03.04 Brabantite? CaTh(PO4)2 P 21 2
 
38.04.03.05 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m
 
38.04.03.06 Gasparite-(Ce) CeAsO4 P 21/n 2/m
 
38.04.03.07 Monazite-(Sm)! SmPO4 P 21/n 2/m
Help on  Strunz Class: Strunz Class: 08.AD.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.A - Phosphates, etc. without additional anions, without H2O
  08.AD -With only large cations
 
08.AD.50 Brabantite? CaTh(PO4)2 P 21 2
 
08.AD.50 Gasparite-(Ce) CeAsO4 P 21/n 2/m
 
08.AD.50 Monazite-(Ce) (Ce,La,Nd,Th)PO4 P 21/n 2/m
 
08.AD.50 Monazite-(La) (La,Ce,Nd)PO4 P 21/n 2/m
 
08.AD.50 Monazite-(Nd) (Nd,Ce,La)(P,Si)O4 P 21/n 2/m
 
08.AD.50 Rooseveltite BiAsO4 P 2/m 2/m
 
08.AD.50 Monazite-(Sm)! SmPO4 P 21/n 2/m
 

Other Monazite-(Nd) Information

Help on References: References: NAME( Sinkankas66) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Mason68)
Help on See Also: See Also: Links to other databases for Monazite-(Nd) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
13 - Uranium Minerals

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Print or Cut-and-Paste your Monazite-(Nd) Specimen Label here :

Monazite-(Nd)

(Nd,Ce,La)(P,Si)O4
Dana No: 38.04.03.05 Strunz No: 08.AD.50
Locality:

 

Notes:

 

 
   
 


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