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Oxy-dravite (Oxydravit)

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Oxy-Dravit
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Oxy-Dravit
Locotal-Brekzie, Cristalmayu, Alto Chapare Distrikt, Chapare, Cochabamba, BO; Bildbreite ca. 10mm
Copyright: Stefan; Contribution: Stefan
Location: Bolivien/Cochabamba, Departamento/Chapare, Provinz/Alto Chapare Distrikt/Cristalmayu/Locotal-Brekzie
Mineral: Oxy-dravite
Image: 1634684836
License: Usage for Mineralienatlas project only
Oxy-Dravit

Locotal-Brekzie, Cristalmayu, Alto Chapare Distrikt, Chapare, Cochabamba, BO; Bildbreite ca. 10mm

Copyright: Stefan
Contribution: Stefan 2021-10-19
Locality: Locotal-Brekzie / Cristalmayu / Alto Chapare Distrikt / Chapare, Provinz / Cochabamba, Departamento / Bolivien

You find additional specimen at the Geolitho Museum

Collectors Summary

Color dunkelrot
Streak color rosa
Lustre Glasglanz
Hardness (Mohs) 7
Fracture muschelig
Crystal System trigonal, R3m

Additional information / Summary

End-Member Formel: NaY(Al3)Z(Al4Mg2)Si6O18(BO3)3(OH)3O

Die representativste Strukturformel: NaY(Al2Mg)Z(Al5Mg)Si6O18(BO3)3(OH)3O

Die Mg-Al-Störung über die Y- und Z-Sites wird durch die Kurzstrecken-Bindungsvalenz-Anforderungen von O2- bei O1 gesteuert.

Die Menge an Mg in der Stelle Z ist eine Funktion des Grades der Fehlanpassung der Kationengröße bei Z

Chemism

Chemical formula

Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O

Additional chem. information

Turmalin-Supergruppe

Chemical composition

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

Unit weight: 960.4251086 u; Number of atoms in the formula: 53

Info

Empirical formula:

Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.31

3

5.66

1.0079470

3.0238410

Boron

B

3.38

3

5.66

10.8117000

32.4351000

Oxygen

O

51.64

31

58.49

15.9994300

495.9823300

Sodium

Na

2.39

1

1.89

22.9897702

22.9897702

Magnesium

Mg

5.06

2

3.77

24.3050600

48.6101200

Aluminium

Al

19.67

7

13.21

26.9815382

188.8707674

Silicon

Si

17.55

6

11.32

28.0855300

168.5131800

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.19-017

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

Classification by Hölzel

9.CE.107

9: SILICATES
C: Cyclosilicates
E: Tourmaline-Group
1: Alkali-Subgroup 1 and 2 - Dravites and Elbaites

IMA status

anerkannt Juli 2012 - CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

Tourmaline supergroup  ⇒ Alkali-Tourmaline group  ⇒ Tourmaline Alkali-subgroup 1

Optical Properties

Color

dunkelrot

Streak color

rosa

Diaphaneity (Transparency)

teiweise durchscheinend

Lustre

Glasglanz

max. Birefringence

0.030

Birefringence chart\! Oxy-dravite title=Birefringence chart Oxy-dravite

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

ω = 1.650(5)

RI value γ / ε

ɛ = 1.620(5)

2V angle

Uniaxial (-)

Pleochroism

In linear polarisiertem Licht ist Oxy-Dravit pleochroisch; O = orange und E = pink

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

15.9273

Cell parameters b (Å)

-

Cell parameters c (Å)

7.2001

Cell parameters a/b or c/a

0.452

Cell parameters c/b

-

Z

3

Volume (ų)

1581.807

Crystal structure

Struktur bestimmt

X-Ray Powder Diffraction

6.377(44), 4.222(67), 3.983(64), 3.483(84), 2.963(100), 2.576(68), 2.041(35), 1.915(52)

XRD chart Oxy-dravite

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)

7

Density (g/cm³)

3.073 (berechnet)

3.025 ( ρ calc. Mineralienatlas )

Fracture

muschelig

(Co-)Type locality

(Co-)Type locality

Kenia/Narok County/Osarara

Type material

Museum der Mineralogie, Erdwissenschaften, Sapienza University von Rom, Rom, Italien

Collection number of type material

33066

Preface

Author (Name, Year)

Ferdinando Bosi und Henrik Skogby (2012)

References

CNMNC Newsletter No. 14, October 2012, page 1282; Mineralogical Magazine, 76, 1281-1288

Bosi, F. & Skogby, H.: Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new mineral species of the tourmaline supergroup - American Mineralogist, Volume 98 (2013) S. 1442–1448.

G. D. Gatta, F. Bosi, G. J. Mcintyre, H. Skogby: First accurate location of two proton sites in tourmaline: A single-crystal neutron diffraction study of oxy-dravite. Mineral Mag Vol. 78, Nr. 3 (2014) S. 681-692.

Lenka Skřápková ; Jan Cempírek; Philippe M. Belley; Lee A. Groat; Radek Škoda: Physical properties and crystal structure of near end-member oxy-dravite from the Beluga occurrence, Nunavut territory, Canada. Mineralogical Magazine Vol. 87, Nr. 5 (2023) S. 719-730. Open Access doi: 10.1180/mgm.2023.59

IMA group assignments

 
 
trigonal
R3m



 
 
 
 
NaMg3(Cr,Fe3+)6(BO3)3Si6O18(OH)4
trigonal
R3m

 
 
 
 
NaMg3Al6(BO3)3Si6O18(OH)4
trigonal
R3m

 
 
 
 
NaMg3Al6Si6O18(BO3)3(OH)3F
trigonal
R3m

 
 
 
 
NaFe2+3Al6Si6O18(BO3)3(OH)3F
trigonal
R3m

 
 
 
 
NaMn2+3Al6(Si6O18)(BO3)3(OH)3F
trigonal
R3m

 
 
 
 
NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
trigonal
R3m

 
 
 
 
Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O
trigonal
R3m

 
 
 
 
Na(Mg,V3+)3(V3+,Al,Cr3+)6[(OH,O)4|(BO3)3|(Si6O18]
trigonal
R3m

 
 
 
 
NaFe2+3Al6(BO3)3Si6O18(OH)4
trigonal
R3m

 
 
 
 
NaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)
trigonal
R3m

 
 
 
 
NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
trigonal
R3m

 
 
 
 
NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O
trigonal
R3m

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Actuality: 25. Mar 2024 - 17:51:16

Other languages

German

Oxy-Dravit

English

Oxy-dravite

Russian

Оксидравит

Russian

Оксихромдравит

Alternative Name

German

Oxydravit

Oxyravit

CNMNC (IMA)-Number

IMA 2012-004a

CNMNC symbol

Symbol

Odrv

Locations with GPS information

IDs

GUSID (Global unique identifier short form) iZSQmeYhMUGyy7NeqwTzmA
GUID (Global unique identifier) 99909489-21E6-4131-B2CB-B35EAB04F398
Database ID 7439