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Vanadio-oxy-chromium-dravite

Collectors Summary

Color dunkelgrün
Streak color grün
Hardness (Mohs) 7-7,5
Crystal System trigonal, R3m

Chemism

Chem­ical formula

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

Addi­tional chem. informa­tion

Turmalin-Supergruppe

Chem­ical com­po­si­tion

Chrom, Magnesium, Natrium, Silicium, Bor, Sauerstoff, Vanadium, Wasserstoff

Unit weight: 1132.3635112 u; Number of atoms in the formula: 53

Info

Empirical formula:

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

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.27

3

5.66

1.0079470

3.0238410
Boron

B

2.86

3

5.66

10.8117000

32.4351000
Oxygen

O

43.80

31

58.49

15.9994300

495.9823300
Sodium

Na

2.03

1

1.89

22.9897702

22.9897702
Magnesium

Mg

4.29

2

3.77

24.3050600

48.6101200
Silicon

Si

14.88

6

11.32

28.0855300

168.5131800
Vanadium

V

13.50

3

5.66

50.9415100

152.8245300
Chromium

Cr

18.37

4

7.55

51.9961600

207.9846400

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.19-032

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

Clas­sifica­tion by Hölzel

9.CE.113

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

IMA sta­tus

anerkannt August 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

dunkelgrün

Streak color

grün

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell param­e­ters a (Å)

16.1260

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

7.3759

Cell param­e­ters a/b or c/a

0.457

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

1661.112

Kristall struc­ture

Struktur bestimmt

X-Ray Pow­der Diffrac­tion

6.509(100), 4.293(31), 4.022(40), 3.564(53), 3.022(47), 2.611(42), 2.171(42), 2.075(40)
XRD chart Vanadio-oxy-chromium-dravite

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

Crystals 3D

Open larger view

Physical Properties

Hard­ness (Mohs)

7-7,5

Density (g/cm³)

3.396 ( ρ calc. Mineralienatlas )

(Co-)Type locality

(Co-)Type locality

Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Baikalsee/Sljudjanka (Sludyanka; Slyudyanka)/Pokhabikha-Tal/Pereval Marmorsteinbruch (Grube Kaber)

Type mate­r­ial

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

Col­lec­tion number of type mate­r­ial

33067

Preface

Author (Name, Year)

Ferdinando Bosi, Leonid Reznitskii, Henrik Skogby und Ulf Hålenius (2012)

References

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

IMA group assignments

Other languages

English

Vanadio-oxy-chromium-dravite

German

Vanadium-Oxy-Chrom-Dravit

Alternative Name

German

Vanadio-Oxy-Chromdravit

Lapis-Mineralienverzeichnis 2018

Vanadiooxychromdravit

CNMNC (IMA)-Number

IMA 2012-034

CNMNC symbol

Symbol

Vocdrv

Automatic Links to external internet sources (Responsibility is with the operator)

German pages

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English pages

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