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Monazite-(Sm)

Formula:
(Sm,Gd,Ce,Th)(PO
 
4
)
System:MonoclinicColour:white to yellow
Name:From the Greek μουάζειυ "to be solitary" in allusion to the rarity of its presence in the first known localities, plus "Sm" as the Sm-dominant member of the Monazite series.


Monazite Group

Classification of Monazite-(Sm)

IMA status:Approved 2001
Strunz 8th edition ID:7/A.15-32
Nickel-Strunz 10th (pending) edition ID:8.AD.50

8 : PHOSPHATES, ARSENATES, VANADATES
A : Phosphates, etc. without additional anions, without H2O
D : With only large cations
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Type Occurrence of Monazite-(Sm)

Type Locality:Annie Claim #3 pegmatite, Bird River Greenstone Belt, Manitoba, Canada

Physical Properties of Monazite-(Sm)

Lustre:Vitreous, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:white to yellow
Streak:white
Cleavage:Distinct/Good
Density (calculated):5.51 g/cm3

Crystallography of Monazite-(Sm)

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/m (P1 1 21/m) [P21/m] {P1 21/m 1}
Cell Parameters:a = 6.725Å, b = 6.936Å, c = 6.448Å
β = 104.02°
Ratio:a:b:c = 0.97 : 1 : 0.93
Unit Cell Volume:V 291.8 ų
Z:4

Chemical Properties of Monazite-(Sm)

Formula:
(Sm,Gd,Ce,Th)(PO
 
4
)
All elements listed in formula:Ce, Gd, O, P, Sm, Th

Relationship of Monazite-(Sm) to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.AD.05Nahpoite
Na
 
2
HPO
 
4
8.AD.10Monetite
CaHPO
 
4
8.AD.10Weilite
CaHAsO
 
4
8.AD.10Švenekite
Ca(H
 
2
AsO
 
4
)
 
2
8.AD.15Archerite
(K,NH
 
4
)[H
 
2
PO
 
4
]
8.AD.15Biphosphammite
(NH
 
4
,K)H
 
2
PO
 
4
8.AD.20Phosphammite
(NH
 
4
)
 
2
HPO
 
4
8.AD.25Buchwaldite
NaCaPO
 
4
8.AD.30Schultenite
PbHAsO
 
4
8.AD.35Chernovite-(Y)
YAsO
 
4
8.AD.35Dreyerite
BiVO
 
4
8.AD.35Wakefieldite-(Ce)
(Ce,Pb)VO
 
4
8.AD.35Wakefieldite-(Y)
YVO
 
4
8.AD.35Xenotime-(Y)
YPO
 
4
8.AD.35Pretulite
ScPO
 
4
8.AD.35Xenotime-(Yb)
YbPO
 
4
8.AD.40Pucherite
BiVO
 
4
8.AD.45Ximengite
BiPO
 
4
8.AD.50Gasparite-(Ce)
(Ce,REE)AsO
 
4
8.AD.50Monazite-(Ce)
(Ce,La,Nd,Th)PO
 
4
8.AD.50Monazite-(La)
(La,Ce,Nd)PO
 
4
8.AD.50Monazite-(Nd)
(Nd,La,Ce)PO
 
4
8.AD.50Rooseveltite
BiAsO
 
4
8.AD.50Cheralite
(Ca,Ce)(Th,Ce)[PO
 
4
]
 
2
8.AD.55Tetrarooseveltite
Bi(AsO
 
4
)
8.AD.60Chursinite
(Hg-Hg)
 
0.5
Hg
2+
 
[AsO
 
4
]
8.AD.65Clinobisvanite
BiVO
 
4

Other Names for Monazite-(Sm)

Synonyms:
IMA2001-001
Other Languages:
Russian:Монацит-(Sm)

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Monazite-(Sm)

Reference List:Masau, M., P. Cerny, M.A. Cooper, R. Chapman & J. Grice (2002): Monazite-(Sm), a new member of the monazite group from the Annie Claim #3 granitic pegmatite, southeastern Manitoba. Canadian Mineralogist: 40: 1649-1655.

Mitt. Öster. Mineral. Gesell. (2001): 146: 189-190.

Articles/Blogs about Monazite-(Sm)

Internet Links for Monazite-(Sm)

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    Localities for Monazite-(Sm)

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Canada
     
    • Manitoba
      • Bird River Greenstone Belt
    		M. Masau, P. Cerny, M.A. Cooper, R. Chapman & J. Grice (2002) Can. Mineral. 40, 1649-1655
    Russia
     
    • Eastern-Siberian Region
      • Tuva Republic
        • Sayan Mts
    		P.M. Kartashov data
    Mineral and/or Locality
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