Monazite-(Sm) Mineral Data
General Monazite-(Sm) Information
Chemical Formula:
SmPO4
Composition:
Molecular Weight = 221.25 gm
Calcium 1.81 % Ca 2.53 % CaO
Cerium 9.50 % Ce 11.13 % Ce2 O3
Samarium 13.59 % Sm 15.76 % Sm2 O3
Gadolinium 14.21 % Gd 16.38 % Gd2 O3
Thorium 15.73 % Th 17.90 % ThO2
Phosphorus 12.60 % P 28.87 % P2 O5
Neodymium 6.52 % Nd 7.60 % Nd2 O3
Oxygen 26.03 % O
______ ______
100.00 % 100.18 % = TOTAL OXIDE
Empirical Formula:
Sm0.2 Gd0.2 Th0.15 Ce0.15 Ca0.1 Nd0.1 (PO4 )0.9
Environment:
Lepidolite-subtype granitic pegmatite within the Greer Lake intrusion of pegmatitic leucogranite. Monazite group, structure
IMA Status:
Approved IMA 2002 (Dana # Added)
Locality:
Anne Claim #3, 1.2 km northwest of Greer Lake, southeatern Mintoba, Canada. Link to MinDat.org Location Data.
Name Origin:
Named as the Sm-dominant member of the monazite series.
Name Pronunciation:
Monazite-(Sm)
Synonym:
ICSD 79751
IMA2001-001
PDF 46-1329
Monazite-(Sm) Image
Images:
Monazite-(Sm)
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
Axial Ratios:
a:b:c =0.9695:1:0.9296
Cell Dimensions:
a = 6.725, b = 6.936, c = 6.448, Z = 4; beta = 104.02° V = 291.80 Den(Calc)= 5.04
Crystal System:
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21 /n
X Ray Diffraction:
By Intensity(I/Io ): 3.065(1)(120), 2.857(0.9)(1 12,012), 4.162(0.8)(1 11), 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)
Cleavage:
{???} Good
Color:
Yellowish.
Diaphaneity:
Translucent to transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Platy - Sheet forms (e.g. micas).
Habit:
Subhedral Crystals - Occurs as crystals which tend to exhibit a recognizable crystal shape.
Luster:
Vitreous - Greasy
Streak:
white
Optical Properties of Monazite-(Sm)
Gladstone-Dale:
CI calc = -0.005 (Superior) - where the CI = (1-KPDcalc /KC ) KPDcalc = 0.1559,KC = 0.1551 Ncalc = 1.78
Optical Data:
Biaxial (+), a=1.768, b=1.771, g=1.818, bire=0.0500
Calculated Properties of Monazite-(Sm)
Electron Density:
Bulk Density (Electron Density)=4.45 gm/cc note: Specific Gravity of Monazite-(Sm) =5.04 gm/cc.
Fermion Index:
Fermion Index = 0.15 Boson Index = 0.85
Photoelectric:
PEMonazite-(Sm) = 658.05 barns/electronU=PEMonazite-(Sm) x r electron =2,929.09 barns/cc.
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
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 / 7.24 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
Dana Class:
38.04.03.07 (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
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
References:
NAME( CanMin, v 41, p 820) PHYS. PROP.(CanMin, v 41, p 820) OPTIC PROP.(CanMin, v 41, p 820)
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
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Monazite-(Sm)
SmPO4
Dana No: 38.04.03.07 Strunz No: 08.AD.50
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