Mineralogy Database

Monazite-(Sm) Mineral Data

Search Webmineral :

General Monazite-(Sm) Information

Help on Chemical  Formula: Chemical Formula: SmPO4
Help on Composition: Composition: Molecular Weight = 221.25 gm
   Calcium      1.81 %  Ca    2.53 % CaO
   Cerium       9.50 %  Ce   11.13 % Ce2O3
   Samarium    13.59 %  Sm   15.76 % Sm2O3
   Gadolinium  14.21 %  Gd   16.38 % Gd2O3
   Thorium     15.73 %  Th   17.90 % ThO2
   Phosphorus  12.60 %  P    28.87 % P2O5
   Neodymium    6.52 %  Nd    7.60 % Nd2O3
   Oxygen      26.03 %  O
              ______        ______ 
              100.00 %      100.18 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Sm0.2Gd0.2Th0.15Ce0.15Ca0.1Nd0.1(PO4)0.9
Help on Environment: Environment: Lepidolite-subtype granitic pegmatite within the Greer Lake intrusion of pegmatitic leucogranite. Monazite group, structure
Help on IMA Status: IMA Status: Approved IMA 2002 (Dana # Added)
Help on Locality: Locality: Anne Claim #3, 1.2 km northwest of Greer Lake, southeatern Mintoba, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the Sm-dominant member of the monazite series.
Help on Name Pronunciation: Name Pronunciation: Monazite-(Sm) Say MONAZITE-(SM)
Help on Synonym: Synonym: ICSD 79751
  PDF 46-1329

Monazite-(Sm) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Back-scattered electron image of the main aggregate of monazite-(Sm) and manganocolumbite (C) embedded in quartz (black). Variations in brightness of the monazite-(Sm) are controlled by the Th content, whereas the ratio Nb/Ta affects manganotantalite.
Location: Annie Claim #3 pod, Greer Lake intrusion, Archean Bird River Subprovince of the Superior Province, Southeastern Manitoba, Canada. Scale: Grain size 0.8 mm.
© Canadian Mineralogist

Monazite-(Sm) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9695:1:0.9296
Help on Cell Dimensions: Cell Dimensions: a = 6.725, b = 6.936, c = 6.448, Z = 4; beta = 104.02° V = 291.80 Den(Calc)= 5.04
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): 3.065(1)(120), 2.857(0.9)(112,012), 4.162(0.8)(111),3.264(0.7)(200), 4.647(0.5)(011), 3.492(0.4)(111,020), 5.19(0.4),

Physical Properties of Monazite-(Sm)

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Yellowish.
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: white

Optical Properties of Monazite-(Sm)

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1559,KC= 0.1551
Ncalc = 1.78
Help on Optical Data: Optical Data: Biaxial (+), a=1.768, b=1.771, g=1.818, bire=0.0500

Calculated Properties of Monazite-(Sm)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.45 gm/cc
note: Specific Gravity of Monazite-(Sm) =5.04 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.15
Boson Index = 0.85
Help on Photoelectric: Photoelectric: PEMonazite-(Sm) = 658.05 barns/electron
U=PEMonazite-(Sm) x relectron=2,929.09 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 297,115.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Monazite-(Sm) per GRapi unit = 3.37 (PPM)

Monazite-(Sm) 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) 102.37 ± 25.59 grams of pure Monazite-(Sm) .

Estimated Radioactivity from Monazite-(Sm) - strong
Curies (Ci)
If Held in Hand
For One Hour
1000 gm / 7.24 cm 7,064,896 1.91E-04 297,115.85 97.68
100 gm / 3.36 cm 706,490 1.91E-05 29,711.58 9.77
10 gm / 1.56 cm 70,649 1.91E-06 2,971.16 0.98
1 gm / 7.24 mm 7,065 1.91E-07 297.12 0.10
0.1 gm / 3.36 mm 706 1.91E-08 29.71 0.01
0.01 gm / 1.56 mm 71 1.91E-09 2.97 0.00
0.001 gm / 0.72 mm 7 1.91E-10 0.30 0.00

Weight of pure Monazite-(Sm) in grams (gm) and Calculated Diameter of a Sphere with a Density of 5.04 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-(Sm) 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.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-(Sm) Information

Help on References: References: NAME( CanMin, v 41, p 820) PHYS. PROP.(CanMin, v 41, p 820) OPTIC PROP.(CanMin, v 41, p 820)
Help on See Also: See Also: Links to other databases for Monazite-(Sm) :
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
11 - Uranium Minerals

Search for Monazite-(Sm) using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Monazite-(Sm) :

Ask about Monazite-(Sm) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

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


Dana No: Strunz No: 08.AD.50





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.