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Monazite-(Sm)

Collectors Summary

Color gelblichweiß
Streak color weiß
Cleavages gut
Fracture uneben
Crystal System monoklin, P21/n

Chemism

Chemical formula

Sm(PO4)

Chemical composition

Samarium, Phosphor, Sauerstoff

Unit weight: 245.3344812 u; Number of atoms in the formula: 6

Info

Empirical formula:

Sm(PO4)

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Oxygen

O

26.09

4

66.67

15.9994300

63.9977200

Phosphorus

P

12.63

1

16.67

30.9737612

30.9737612

Samarium

Sm

61.29

1

16.67

150.3630000

150.3630000

Analysis wt%

P2O5 : 27.48, SiO2 : 1.53, ZrO2 : 0.71, ThO2 : 16.27, UO2 : 0.62, Y2O3 : 1.29, La2O3 : 2.10, Ce2O3 : 10.04, Pr2O3 : 1.58, Nd2O3 : 6.03, Sm2O3 : 13.02, Gd2O3 : 12.06, Tb2O3 : 1.14, Dy2O3 : 1.18, PbO : 2.14, CaO : 2.75, Ln2O3 : 48.51 (Ref: Canadian Mineralogist 2002)

Strunz 9th edition incl. updates

8.AD.50

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
D: Mit ausschließlich großen [Kationen]
50:Monazit-Gruppe

Lapis Classification

VII/A.15-035

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
15: Sehr große Kationen: Ca-Na-K, SE, Bi u.a.; Monazit-Gruppe

Classification by Hölzel

8.AF.120

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
F: Monazite-Group

Dana 8th edition

38.04.03.07

38: Anhydrous Phosphates, etc
04: Anhydrous Phosphates, etc A+ XO4
03: Monazite Group (Monoclinic: P21/n)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Monazite group

Optical Properties

Color

gelblichweiß

Streak color

weiß

max. Birefringence

0.040

Birefringence chart\! Monazite-(Sm) title=Birefringence chart Monazite-(Sm)

Michel-Levy Color Chart viewed according to the maximum birefringence (at 30μm). Mineral color is not taken into account. Click on the image to enlarge or change thickness.

RI value α / ω / n

1.768

RI value β

1.771

RI value γ / ε

1.808

Ri mean

1.782

2V angle

Biaxial (+) 29°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

6.725

Cell parameters b (Å)

6.936

Cell parameters c (Å)

6.448

Cell parameters a/b or c/a

0.970

Cell parameters c/b

0.930

Cell parameters α

90°

Cell parameters β

104.2

Cell parameters γ

90°

Z

4

Volume (ų)

291.575

X-Ray Powder Diffraction

5.191(40),
4.647(50),
4.164(80),
4.064(30),
3.492(40),
3.264(70),
3.065(100),
2.857(90)

XRD chart Monazite-(Sm)

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

5.49 (gemessen)

5.588 ( ρ calc. Mineralienatlas )

Cleavages

gut

Fracture

uneben

Tenacity

spröde

Preface

Author (Name, Year)

Masau & Cerný & Cooper & Chapman & Grice, 2001

References

Canadian Mineralogist 40 (2002)

IMA group assignments

Other languages

Spanish

Monacita-(Sm)

German

Monazit-(Sm)

English

Monazite-(Sm)

French

Monazite-(Sm)

Russian

Монацит-(Sm)

Traditional Chinese

釤獨居石

Simplified Chinese

钐独居石

CNMNC (IMA)-Number

IMA 2001-001

CNMNC symbol

Symbol

Mnz-Sm

Locations with GPS information

IDs

GUSID (Global unique identifier short form) SxR9xKTST0OjJUb0uOdOzA
GUID (Global unique identifier) C47D144B-D2A4-434F-A325-46F4B8E74ECC
Database ID 2577