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Povondraite (Povondrait)

Pictures (3 Images total)

Povondrait
Views (File:
1248183580
): 2012
Povondrait
FO: San Francisco Mine, Alto Chapara, Cochabamba, Bolivien; Bildausschnitt: ~ 2 mm
Copyright: rtbstone; Contribution: rtbstone
Collection: rtbstone
Location: Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt
Mineral: Povondraite
Image: 1248183580
Rating: 4 (votes: 2)
License: Usage for Mineralienatlas project only
Povondrait

FO: San Francisco Mine, Alto Chapara, Cochabamba, Bolivien; Bildausschnitt: 2 mm
Collection: rtbstone
Copyright: rtbstone
Contribution: rtbstone 2009-07-21
Locality: Alto Chapare Distrikt / Chapare, Provinz / Cochabamba, Departamento / Bolivien
Povondrait
Views (File:
1561994788
): 408
Povondrait
Povondrait; Alto Chapare,Cochabamba,; Bolivien; BB: 1,5 cm
Copyright: Rockhounder; Contribution: Rockhounder
Collection: Rockhounder
Location: Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt
Mineral: Povondraite
Image: 1561994788
License: Usage for Mineralienatlas project only
Povondrait

Povondrait; Alto Chapare,Cochabamba,; Bolivien; BB: 1,5 cm
Collection: Rockhounder
Copyright: Rockhounder
Contribution: Rockhounder 2019-07-01
Locality: Alto Chapare Distrikt / Chapare, Provinz / Cochabamba, Departamento / Bolivien
Povondrait
Views (File:
1665417605
): 31
Povondrait
Povondrait; Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt; Größe: 8,1 x 6,7 x 6,2 cm
Copyright: Robert F.; Contribution: Doc Fuse
Collection: Robert F., Collection number: VIII E 19.75a
Location: Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt
Mineral: Povondraite
Image: 1665417605
License: Usage for Mineralienatlas project only
Povondrait (SNr: VIII E 19.75a)

Povondrait; Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt; Größe: 8,1 x 6,7 x 6,2 cm
Collection: Robert F.
Copyright: Robert F.
Contribution: Doc Fuse 2022-10-10
Locality: Alto Chapare Distrikt / Chapare, Provinz / Cochabamba, Departamento / Bolivien

Collectors Summary

Color schwarz
Streak color braun
Hardness (Mohs) 6.5
Cleavages keine
Fracture uneben
Solubility + HF
Crystal System trigonal, R3m

Chemism

Chemical formula

(Na,K)(Fe3+,Fe2+)3(Fe3+,Mg,Al)6[(OH)4|(BO3)3|Si6O18]

Chemical composition

Aluminium, Eisen, Magnesium, Natrium, Silicium, Bor, Kalium, Sauerstoff, Wasserstoff

Unit weight: 1156.49565407 u; Number of atoms in the formula: 54

Info

Empirical formula:

(Na0.75K0.25)(Fe0.75Fe0.25)3(Fe0.6Mg0.3Al0.1)6[(OH)4(BO3)3Si6O18]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.35

4

7.41

1.0079470

4.0317880
Boron

B

2.80

3

5.56

10.8117000

32.4351000
Oxygen

O

42.89

31

57.41

15.9994300

495.9823300
Sodium

Na

1.49

0.75

1.39

22.9897702

17.2423277
Magnesium

Mg

3.78

1.8

3.33

24.3050600

43.7491080
Aluminium

Al

1.40

0.6

1.11

26.9815382

16.1889229
Silicon

Si

14.57

6

11.11

28.0855300

168.5131800
Potassium

K

0.85

0.25

0.46

39.0983100

9.7745775
Iron

Fe

31.87

6.6

12.22

55.8452000

368.5783200

Analysis wt%

SiO2 : 31.58, Al2O3 : 2.30, Fe2O3 : 38.37, FeO : 7.25, MgO : 5.57, K2O : 0.98, Na2O : 2.18, B2O3 : 8.98, H2O : 3.50 (Ref: American Mineralogist 79)

Strunz 9th edition incl. updates

9.CK.05

9: Silikate (Germanate)
C: Ringsilikate (Cyclosilikate)
K: ~[Si6O18]12- sechser-Einfachringe, mit inselartig, komplexe [Anionen]
05:

Lapis Classification

VIII/E.19-075

VIII: SILIKATE
E: Ringsilikate
19: Sechserringe [Si6O18] 12-; Turmalin-Gruppe

Classification by Hölzel

9.CE.230

9: SILICATES
C: Cyclosilicates
E: Tourmaline-Group
2: Alkali Tourmalines with V3 W = (OH)3 F or O3 F or (OH)3 O

Dana 8th edition

61.03c.01.06

61: Cyclosilicates Cyclosilicate Six-Membered Rings
03c: Cyclosilicates Cyclosilicate Six-Membered Rings with borate groups (Ferric Tourmaline Subgroup)
01: Buergerite Subgroup

IMA status

Mit Anerkennung der CNMNC umbenannt

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

 Tourmaline supergroup  ⇒ Alkali-Tourmaline group  ⇒ Tourmaline Alkali-subgroup 3

Optical Properties

Color

schwarz

Streak color

braun

Diaphaneity (Transparency)

durchscheinend

max. Birefringence

0.057
Birefringence chart\! Povondraite title=Birefringence chart Povondraite

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

1.800

RI value γ / ε

1.743

Ri mean

1.781

2V angle

Uniaxial (-)

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

16.186

Cell parameters b (Å)

-

Cell parameters c (Å)

7.444

Cell parameters a/b or c/a

0.460

Cell parameters c/b

-

Z

3

Volumne (ų)

1688.947

X-Ray Powder Diffraction

6.63(90),
5.13(70),
4.71(70),
4.32(70),
4.05(90),
3.61(80),
3.05(90),
2.63(100)
XRD chart Povondraite

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

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

6.5

VHN (Hardness Vickers)

960 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

3.26

3.411 ( ρ calc. Mineralienatlas )

Cleavages

keine

Fracture

uneben

Tenacity

nicht definiert, wahrscheinlich spröde

Instability

+ HF

(Co-)Type locality

(Co-)Type locality

Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt/Cristalmayu/San Francisco Mine

Preface

Author (Name, Year)

Grice & Ercit & Hawthorne, 1993

References

American Mineralogist 78 (1993), 433

IMA group assignments

Other languages

German

Povondrait

English

Povondraite

French

Povondraite

Spanish

Povondraíta

Russian

Повондраит

Japanese

ﾎﾟﾎﾞﾝﾄﾞﾗｲﾄ

Alternative Name

Ferri-Eisen-Turmalin

Ferridravit

Spanish

Ferridravita

English

Ferridravite

Japanese

ポヴォンドラ電気石

CNMNC (IMA)-Number

IMA 1978-075

CNMNC symbol

Symbol

Pov

Locations with GPS information