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Pertsevite-(F) (Pertsevit)

Collectors Summary

Color farblos
Streak color weiß
Cleavages keine
Fracture uneben
Crystal System orthorhombisch, Pna21

Chemism

Chemical formula

Mg2[(F,OH)0.5-1|(BO3,SiO4)]

Chemical composition

Magnesium, Silicium, Bor, Fluor, Sauerstoff, Wasserstoff

Unit weight: 130.53894235 u; Number of atoms in the formula: 7.25

Info

Empirical formula:

Mg2[(F0.75(OH)0.25)0.8((BO3)0.75(SiO4)0.25)]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.15

0.2

2.76

1.0079470

0.2015894
Boron

B

6.21

0.75

10.34

10.8117000

8.1087750
Oxygen

O

42.28

3.45

47.59

15.9994300

55.1980335
Fluorine

F

8.73

0.6

8.28

18.9984033

11.3990420
Magnesium

Mg

37.24

2

27.59

24.3050600

48.6101200
Silicon

Si

5.38

0.25

3.45

28.0855300

7.0213825

Analysis wt%

SiO2 : 8.25, B2O3 : 22.44, FeO : 3.71, MgO : 57.39, MnO : 0.65, F : 7.81, H2O : 1.67 (Ref: European Journal of Mineralogy 2003)

Strunz 9th edition incl. updates

6.AB.75

6: Borate
A: Monoborate
B: BO3 mit zusätzlichen Anionen; 1(Δ) + OH, etc.
75:Pertsevit-Gruppe

Lapis Classification

V/G.03-005

V: NITRATE, CARBONATE UND BORATE
G: Inselborate
3: [BO3] 3--Inseln

Classification by Hölzel

6.AB.620

6: Borates
A: Monoborates
B: BO3, with additional anions - 1(P)+OH, etc.
6: Fluoborite-Group (structurally closely related)

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

farblos

Streak color

weiß

max. Birefringence

0.033
Birefringence chart\! Pertsevite-(F) title=Birefringence chart Pertsevite-(F)

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

1.609

RI value β

1.620

RI value γ / ε

1.642

Ri mean

1.624

2V angle

Biaxial (+) 65°

Crystallography

Crystal System

orthorhombisch

Class (H-M)

mm2

Space Group number

33

Space Group

Pna21

Cell parameters a (Å)

20.490

Cell parameters b (Å)

4.571

Cell parameters c (Å)

11.890

Cell parameters a/b or c/a

4.483

Cell parameters c/b

2.601

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

90°

Z

16

Volume (ų)

1113.615

X-Ray Powder Diffraction

2.745(80),
2.474(50),
2.414(50),
2.241(100),
2.234(50),
1.708(90),
1.705(40),
1.481(40)
XRD chart Pertsevite-(F)

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

Crystal Structure 3D

Open larger view

Physical Properties

Density (g/cm³)

3.12

3.114 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

(Co-)Type locality

(Co-)Type locality

Russland/Ferner Osten, Föderationskreis/Sacha (Sakha, Jakutien, Якутия), Republik/Werchojansk (Verkhoyansk), Rajon/Jana-Tal/Dogdo, Fluss/Kebirnin'ya, Bach

Preface

Author (Name, Year)

Schreyer & Armbruster & Bernhardt & Medenbach, 2003

References

European Journal of Mineralogy 15 (2003), 1007

Other languages

German

Pertsevit-(F)

Spanish

Pertsevita-(F)

French

Pertsevite-(F)

English

Pertsevite-(F)

Umbenannt - Neue Mineralien - IMA Web-Seite, Okt. 2009

Russian

Перцевит

Russian

Перцевит-(F)

Traditional Chinese

氟矽硼鎂石

Simplified Chinese

氟硅硼镁石

old name

German

Pertsevit

Umbenannt - Neue Mineralien - IMA Web-Seite, Okt. 2009

English

Pertsevit

CNMNC (IMA)-Number

IMA 2002-030

CNMNC symbol

Symbol

Psv-F

Locations with GPS information

IDs

GUSID (Global unique identifier short form) _USomINTAE6yPlf9ZwE4LQ
GUID (Global unique identifier) 98A844FD-5383-4E00-B23E-57FD6701382D
Database ID 3005