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Farringtonite (Farringtonit)

Additional Functions

Collectors Summary

Color wachsgelb
Streak color weiß
Solubility +++ Säuren, - H2O
Crystal System monoklin, P21/n

Chemism

Chemical formula

Mg3(PO4)2

Chemical composition

Magnesium, Phosphor, Sauerstoff

Unit weight: 262.8581424 u; Number of atoms in the formula: 13

Info

Empirical formula:

Mg3(PO4)2

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Oxygen

O

48.69

8

61.54

15.9994300

127.9954400
Magnesium

Mg

27.74

3

23.08

24.3050600

72.9151800
Phosphorus

P

23.57

2

15.38

30.9737612

61.9475224

Analysis wt%

P2O5 : 53.20, MgO : 43.10, FeO : 4.10 (Ref: American Mineralogist 73)

Strunz 9th edition incl. updates

8.AB.05

8: Phosphate, Arsenate, Vanadate
A: Phosphate, etc., ohne weitere Anionen, ohne H2O
B: Mit mittelgroßen [Kationen]
05:Farringtonit

Lapis Classification

VII/A.05-010

VII: PHOSPHATE, ARSENATE UND VANADATE ("Phosphate" des Registers immer einschließlich isotyper Arsenate und Vanadate!)
A: Wasserfreie Phosphate [PO4] 3-, ohne fremde Anionen
5: Mittelgroße Kationen: Fe-Mn vorwiegend

Classification by Hölzel

8.AB.360

8: PHOSPHATES ARSENATES VANADATES
A: Phosphates (-anions -water)
B: Phosphates, C medium Triphylite-Group
3: Graftonite-Sarcopside-Group

Dana 8th edition

38.03.01.02

38: Anhydrous Phosphates, etc
03: Anhydrous Phosphates, etc (A+ B++)3 (XO4)2
01: Sarcopside Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

wachsgelb

Streak color

weiß

max. Birefringence

0.019
Birefringence chart\! Farringtonite title=Birefringence chart Farringtonite

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

1.540

RI value β

1.544

RI value γ / ε

1.559

Ri mean

1.548

2V angle

Biaxial (+) 55°

Crystallography

Crystal System

monoklin

Class (H-M)

2/m

Space Group number

14

Space Group

P21/n

Cell parameters a (Å)

8.79

Cell parameters b (Å)

8.22

Cell parameters c (Å)

5.07

Cell parameters a/b or c/a

1.069

Cell parameters c/b

0.617

Cell parameters α

90°

Cell parameters β

120.50

Cell parameters γ

90°

Z

2

Volumne (ų)

315.638

X-Ray Powder Diffraction

4.34(40),
4.09(40),
3.85(70),
3.65(40),
3.443(100),
2.531(30),
2.500(30),
2.411(50)
XRD chart Farringtonite

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

2.80 (gemessen)

2.766 ( ρ calc. Mineralienatlas )

Instability

+++ Säuren, - H2O

(Co-)Type locality

(Co-)Type locality

Kanada/Saskatchewan/Saskatoon/Springwater

Preface

Author (Name, Year)

DuFresne & Roy, 1961

References

American Mineralogist 58 (1973), 949

Other languages

German

Farringtonit

Spanish

Farringtonita

English

Farringtonite

French

Farringtonite

Russian

Фаррингтонит

Traditional Chinese

磷鎂石

Simplified Chinese

磷镁石

CNMNC symbol

Symbol

Frt