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Dravite

Pictures (155 Images total)

Dravit
Views (Image: 1438960696): 3211, Rating: 9
Dravit

Dravit-Kristall auf Dolomit; Fundort: Balmen, Binntal, Wallis, Schweiz; Bildbreite: 4,6 mm

Collection: guefz
Copyright: guefz
Contribution: guefz 2015-08-07
Locality: Balmen / Bochtehorn (Bochtenhorn) / Albrunhorn-Schinhorn-Gebiet / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz
Dravit
Views (Image: 1462862668): 1645, Rating: 8.83
Dravit (SNr: Binn-SwB-Dravit-1-1-3)

Bildbreite etwa 3mm; kurzprismatischer Dravit-Kristall vom Schwarzenbach am Messerbach im Binntal, Wallis, Schweiz.

Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2016-05-10
Locality: Schwarzenbach / Messerbach (Mässerbach) / Fäld (Imfeld, Im Feld) / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz
Dravit
Views (Image: 1283764280): 4892
Dravit

Größe: 1,84 mm; Fundort: Marmorbruch Crevola d'Ossola, Val d'Ossola, Piemont, Italien

Collection: Domenico Preite
Copyright: Matteo Chinellato
Contribution: Hg 2010-09-06
Locality: Crevola d'Ossola (Marmorbruch) / Ossola, Valle (Tal) / Verbano-Cusio-Ossola, Provinz / Piemont (Piemonte), Region / Italien
Dravit
Views (Image: 1290456538): 2126
Dravit

Kristallgröße: 3 mm; Fundort: Cava di Laghetto, Cuasso al Monte, Provinz Varese, Lombardei, Italien

Collection: Enrico Bonacina
Copyright: Enrico Bonacina
Contribution: slugslayer 2010-11-22
Locality: Cava Laghetto / Cuasso al Monte / Varese, Provinz / Lombardei (Lombardia), Region / Italien
Dravit
Views (Image: 1461520344): 937
Dravit (SNr: Len-Drav-1-1-2)

Bildhöhe etwa 4,5 mm; zweifarbige prismatische Dravit-Kristalle von der Mineraliengrube Lengenbach, Binntal, Wallis, Schweiz.

Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2016-04-24
Locality: Grube Lengenbach / Fäld (Imfeld, Im Feld) / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz
Dravit
Views (Image: 1461520380): 1081
Dravit (SNr: Len-Drav-1-1-6)

Bildhöhe etwa 3,5 mm; prismatischer Dravit-Kristall von der Mineraliengrube Lengenbach, Binntal, Wallis, Schweiz.

Collection: Klaus Schäfer
Copyright: Klaus Schäfer
Contribution: Klaus Schäfer 2016-04-24
Locality: Grube Lengenbach / Fäld (Imfeld, Im Feld) / Binn / Goms, Bezirk / Wallis, Kanton / Schweiz

Collectors Summary

Color schwarz, schwarzbraun, braun, gelb, orange, grünlich, bläulich
Streak color farblos
Lustre Glasglanz
Hardness (Mohs) 7 - 7.5
Solubility + HF
Crystal System trigonal, R3m

Chemism

Chem­ical formula

NaMg3Al6(BO3)3Si6O18(OH)4

Chem­ical com­po­si­tion

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

Unit weight: 958.7565774 u; Number of atoms in the formula: 54

Info

Empirical formula:

NaMg3Al6(BO3)3Si6O18(OH)4

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)

Hydrogen

H

0.42

4

7.41

1.0079470

4.0317880

Boron

B

3.38

3

5.56

10.8117000

32.4351000

Oxygen

O

51.73

31

57.41

15.9994300

495.9823300

Sodium

Na

2.40

1

1.85

22.9897702

22.9897702

Magnesium

Mg

7.61

3

5.56

24.3050600

72.9151800

Aluminium

Al

16.89

6

11.11

26.9815382

161.8892292

Silicon

Si

17.58

6

11.11

28.0855300

168.5131800

Anal­y­sis wt%

SiO2 : 34.01, B2O3 : 10.06, Al2O3 : 29.93, Fe2O3 : 1.65, FeO : 5.25, MgO : 9.92, CaO : 3.05, Na2O : 1.68, H2O : 4.25 (Ref: Mineralogical Magazine 77)

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.19-020

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

Clas­sifica­tion by Hölzel

9.CE.100

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

Dana 8th edi­tion

61.03e.01.09

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

IMA sta­tus

Erstbeschreibung vor CNMNC-Gründung (1959), als Mineral meist anerkannt

Min­eral sta­tus

anerkanntes Mineral

IMA Classification

IMA Clas­sifica­tion

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

Optical Properties

Color

schwarz, schwarzbraun, braun, gelb, orange, grünlich, bläulich

Streak color

farblos

Diaphane­ity (Trans­parency)

transparent bis durchscheinend bis opak

Lus­tre

Glasglanz

max. Birefrin­gence

0.03

Birefringence chart\! Dravite title=Birefringence chart 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

1.65

RI value γ / ε

1.62

Ri mean

1.640

2V angle

Uniaxial (-)

Pleochro­ism

Michail N. Taran and Ievgen V. Naumenko: Usambara effect in tourmaline: optical spectroscopy and colourimetric studies. Mineral Mag. Vol. 80 (2016) S. 705-718. (an Dravit von Tanzania)

Optical Data Luminescence

Color SW-UV (254nm)

 

orangegelb

SW-UV Other Col­ors

 

gelblich

After­glow (Per­sistant Lumi­nes­cence)

keine Daten

Crystallography

Crystal Sys­tem

trigonal

Class (H-M)

3m

Space Group number

160

Space Group

R3m

Cell param­e­ters a (Å)

15.96

Cell param­e­ters b (Å)

-

Cell param­e­ters c (Å)

7.218

Cell param­e­ters a/b or c/a

0.452

Cell param­e­ters c/b

-

Z

3

Volumne (ų)

1592.257

X-Ray Pow­der Diffrac­tion

6.38(20),
4.226(50),
3.989(70),
3.478(50),
2.961(80),
2.581(100),
2.043(40),
1.921(30)

XRD chart 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 - 7.5

VHN (Hard­ness Vick­ers)

1300 (ungefähre Angabe abgeleitet aus der Mohshärte)

Density (g/cm³)

2.98 - 3.2 / Durchschnittlich = 3.09

2.999 ( ρ calc. Mineralienatlas )

Insta­bil­ity

+ HF

(Co-)Type locality

(Co-)Type locality

Slowenien/Unterdrauburg (Dravograd)/Dobrova

Preface

Name from

dem Fluss Drave, Synonym für Drau

Author (Name, Year)

Tschermak, 1883

References

Handbook of Mineralogy (Anthony et al.), 2 (1995), 189

Lehrbuch der Mineralogie. Hölder, Wien (1884), 470

Canadian Mineralogist 49 (2011), 29

IMA group assignments

Other languages

German

Dravit

Spanish

Dravita

French

Dravite

English

Dravite

Russian

Дравит

Japanese

苦土電気石

Traditional Chinese

鎂電氣石

Simplified Chinese

镁电气石

Alternative Name

German

Coronit

Spanish

Coronita

Coronite

Coronite (of Hunt)

German

Gouvernerit

German

Gouverneurit

Spanish

Gouverneurita

English

Gouverneurite

English

Magnodravite

Mg-Turmalin

CNMNC symbol

Symbol

Drv

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

German pages

DeWikiPedia - search for: Dravit
Google-Bilder-Suche - search for: Dravit
Mineralienatlas.de (Forum) - search for: Dravit

English pages

Mindat - search for: Dravite
Webmineral - search for:Dravite
Handbook-of-Mineralogy - search for: Dravite
RRUFF - Raman, XRD and other mineral data - search for: Dravite
RRUFF - References and PDF downloads - search for: Dravite
American-Mineralogist-Crystal-Structure-Database - search for: Dravite
Strahlen.org - search for: Dravite

Russian pages

Webmineral.ru - search for: Дравит

Mineral Dealer

German pages

hausen - Mineralgroßhandel - search for: Dravit
Crystal-Treasure.com - search for: Dravit
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Locations with GPS information