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Oxy-vanadium-dravite (Vanadiumdravit)

Additional Functions

Collectors Summary

Color dunkelgrün, schwarz
Streak color bräunlichgrün, gelblichgrün
Lustre Pechglanz
Hardness (Mohs) 7.00 - 7.50
Cleavages meist unvollkommen (1120),(1011),
Fracture klar
Crystal System trigonal, R3m
Morphology kurzprismatische, zonar aufgebaute Kristalle

Chemism

Chemical formula

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

Chemical composition

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

Unit weight: 1078.99063946 u; Number of atoms in the formula: 53

Info

Empirical formula:

Na(Mg0.75V0.25)3(V0.6Al0.3Cr0.1)6[((OH)0.75O0.25)4(BO3)3(Si6O18]

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Hydrogen

H

0.28

3

5.66

1.0079470

3.0238410
Boron

B

3.01

3

5.66

10.8117000

32.4351000
Oxygen

O

45.97

31

58.49

15.9994300

495.9823300
Sodium

Na

2.13

1

1.89

22.9897702

22.9897702
Magnesium

Mg

5.07

2.25

4.25

24.3050600

54.6863850
Aluminium

Al

4.50

1.8

3.40

26.9815382

48.5667688
Silicon

Si

15.62

6

11.32

28.0855300

168.5131800
Vanadium

V

20.54

4.35

8.21

50.9415100

221.5955685
Chromium

Cr

2.89

0.6

1.13

51.9961600

31.1976960

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.19-035

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

Classification by Hölzel

9.CE.115

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

Dana 8th edition

61.03e.01.12

61: Cyclosilicates Cyclosilicate Six-Membered Rings
03e: Cyclosilicates Cyclosilicate Six-Membered Rings with borate groups (Sodic Tourmaline Subgroup)
01: Schorl Subgroup

Mineral status

anerkanntes Mineral

IMA Classification

IMA Classification

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

Optical Properties

Color

dunkelgrün, schwarz

Streak color

bräunlichgrün, gelblichgrün

Diaphaneity (Transparency)

in dünnen Splittern durchscheinend

Lustre

Pechglanz

max. Birefringence

0.057
Birefringence chart\! Oxy-vanadium-dravite title=Birefringence chart Oxy-vanadium-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

1.786

RI value β

-

RI value γ / ε

1.729

2V angle

Uniaxial (-)

Pleochroism

stark; O = dunkelbräunlichgrün, E = gelblichgrün

Optical Data Luminescence

Luminescence

keine Fluoreszenz bekannt

Crystallography

Crystal System

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell parameters a (Å)

16.12

Cell parameters b (Å)

-

Cell parameters c (Å)

7.39

Cell parameters a/b or c/a

0.458

Cell parameters c/b

-

Z

3

Volumne (ų)

1663.049

X-Ray Powder Diffraction

6.54(90),
5.08(40),
4.04(80),
3.57(70),
3.04(90),
2.62(100),
2.07(90),
1.951(50)
XRD chart Oxy-vanadium-dravite

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

Morphology

kurzprismatische, zonar aufgebaute Kristalle

Crystals 3D

Open larger view

Crystal Structure 3D

Open larger view

Physical Properties

Hardness (Mohs)

7.00 - 7.50

VHN (Hardness Vickers)

1417 (50g)

Density (g/cm³)

3.32 (gemessen)

3.232 ( ρ calc. Mineralienatlas )

Cleavages

meist unvollkommen (1120),(1011),

Fracture

klar

Tenacity

spröde

(Co-)Type locality

(Co-)Type locality

Russland/Sibirien, Föderationskreis/Irkutsk (Irkutskaja), Oblast/Baikalsee/Sljudjanka (Sludyanka; Slyudyanka)

Preface

Associations

Quarz, Calcit, Diopsid, Tremolit, Uwarowit, Goldmanit, Titanit, Anatas, Kosmochlor, Natalyit, Dravit, Pyrit

Name from

Vanadium-Analogon von Dravit

References

Grew, E.S., and Anovitz, L.M. (1996) BORON - Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Reznitsky, E.Z.,Sklyarov, E.V., Ushchapovskaya, Z.F., Nartova, N.V., Kashaev, A.A., Karmanov, N.S. Kanakin, S.V., Smolin, A.S. & Nekrasova, E.A. (2011): Vanadiumdravite NaMg3V6[Si6O18][BO3]3(OH)4, a new mineral of the tourmaline group. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva 130 (2001)(2), 59-72.( in russisch)

Henry, D., Novák, M., Hawthorne, F.C., Ertl, A., Dutrow, B.L., Uher, P. & Pezzotta, F. - Nomenclature of the tourmaline supergroup minerals. American Mineralogist 96 (2011), 895-913.

CNMNC Newsletter No. 13, June 2012, page 816; Mineralogical Magazine 76, 807-817

Bosi, F., Reznitskii, L.Z., Sklyarov, E.V. - Oxy-vanadium-dravite, NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O: Crystal structure and redefinition of the “vanadium-dravite” tourmaline. American Mineralogist 98 (2013), 501-505.

IMA group assignments

Other languages

German

Oxy-Vanadium-Dravit

English

Oxy-vanadium-dravite

Spanish

Vanadiumdravita

Russian

Ванадиодравит

Traditional Chinese

釩電氣石

Simplified Chinese

钒电气石

Japanese

ﾊﾞﾅｼﾞｳﾑ苦土電気石

old name

German

Vanadiumdravit

English

Vanadiumdravite

Alternative Name

Vanadium-dravite

Traditional Chinese

釩鎂電氣石

Simplified Chinese

钒镁电气石

CNMNC (IMA)-Number

IMA 11-E

Renamed to Oxy-vanadium-dravite - CNMNC -Nomenclature proposals approved in November 2011

IMA 1999-050

CNMNC symbol

Symbol

Ovdrv