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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

Volume (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

IDs

GUSID (Global unique identifier short form) NUyay8zbVEm6lmTGuMTzmw
GUID (Global unique identifier) CB9A4C35-DBCC-4954-BA96-64C6B8C4F39B
Database ID 1099