Dravite Mineral Data

Dravite Mineral Data
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General Dravite Information

Help on Chemical Formula: Chemical Formula: NaMg3Al6(BO3)3Si6O18(OH)4
Help on Composition: Composition: Molecular Weight = 958.75 gm
   Sodium      2.40 %  Na    3.23 % Na2O
   Magnesium   7.61 %  Mg   12.61 % MgO
   Aluminum   16.89 %  Al   31.90 % Al2O3
   Silicon    17.58 %  Si   37.60 % SiO2
   Boron       3.38 %  B    10.89 % B2O3
   Hydrogen    0.42 %  H     3.76 % H2O
   Oxygen     51.73 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaMg3Al6(BO3)3Si6O18(OH)4
Help on Environment: Environment: Metasomatically altered magnesian or dolomitic limestones in contact-metamorphic aureoles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1883 (Dana # Changed)
Help on Locality: Locality: Drava River, Austria. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Dravite Say DRAVITE
Help on Synonym: Synonym: Dravite - (61.3.1.9)
  ICSD 72937
  PDF 44-1457
  Tourmaline
 

Dravite Image

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Dravite

Comments: Doubly terminated dravite crystal on white mica shist matrix.
Location: Yinnietharra Station, Gascoyne, Western Australia. Scale: 4 x 4 x 2.9 cm.
© Fabre Minerals
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Dravite

Comments: Greenish-brown chrome-rich dravite tourmaline crystals up to 13 mm long with complex terminations. Fluoresces mildly under UV illumination.
Location: Shako Ranch, Mwatate Kabanga, Voi, Taita-Taveta district, Coast Province, Kenya. Scale: 14x13x10 mm.
© John Betts - Fine Minerals

Dravite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.45172
Help on Cell Dimensions: Cell Dimensions: a = 15.941, c = 7.201, Z = 3; V = 1,584.73 Den(Calc)= 3.01
Help on Crystal System: Crystal System: Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.576(1), 2.961(0.85), 3.99(0.85),
Click Here for Large Dravite Structure Window Crystal Structure:

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Hawthorne F C , MacDonald D J , Burns P C , American Mineralogist , 78 (1993) p.265-270, Reassignment of cation site occupancies in tourmaline: Al-Mg disorder in the, crystal structure of dravite

View Additional jPOWD Structure files for Dravite
[1] [2] [3] [4] [5] [6] [7] [8]
 

Physical Properties of Dravite

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Black, Green, Red, Blue, White.
Help on Density: Density: 2.98 - 3.2, Average = 3.09
Help on Diaphaneity: Diaphaneity: Transparent to translucent to opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Divergent - Crystals radiate from a center without producing stellar forms.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 7-7.5 - Quartz-Garnet
Help on Luminescence: Luminescence: Fluorescent, Short UV=yellow to orange.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: colorless
 

Optical Properties of Dravite

Help on Dichroism (e): Dichroism (e): pale yellow or colorless.
Help on Dichroism (w): Dichroism (w): dark yellowish brown or light yellow.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.034 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.009 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.21,KPDmeas= 0.2045,KC= 0.2118
Ncalc = 1.63 - 1.68
Help on Optical Data: Optical Data: Uniaxial (-), e=1.612-1.63, w=1.631-1.655, bire=0.0190-0.0250.
 

Calculated Properties of Dravite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.99 gm/cc
note: Specific Gravity of Dravite =3.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEDravite = 1.42 barns/electron
U=PEDravite x rElectron Density= 4.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Dravite is Not Radioactive
 

Dravite Classification
Help on Dana Class: Dana Class: 61.03e.01.09 (61)Cyclosilicate Six-Membered Rings
  (61.03e)with borate groups (Sodic Tourmaline Subgroup)
  (61.03e.01)Schorl Subgroup
 
61.03e.01.09 Dravite! NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.03e.01.10 Schorl! NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.03e.01.10a Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m
 
61.03e.01.11 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.03e.01.12 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
Help on Strunz Class: Strunz Class: 09.CK.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CK -[Si6O18]12- 6-membered single rings, with insular complex anions
 
09.CK.05 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
 
09.CK.05 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
 
09.CK.05 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
 
09.CK.05 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
09.CK.05 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
 
09.CK.05 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
09.CK.05 Hydroxyuvite! CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) R 3m 3m
 
09.CK.05 Schorl-(F)! NaFe3Al6Si6O18)(BO3)3(OH)3(F,OH) R 3m 3m
 

Other Dravite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Dravite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Amethyst Galleries' Mineral Gallery
5 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - GeoScienceWorld
11 - Google Images
12 - Google Scholar
13 - Handbook of Mineralogy (MinSocAm)
14 - Handbook of Mineralogy (UofA)
15 - HyperPhysics
16 - MinDAT
17 - Mineral and Gemstone Kingdom
18 - Mineralienatlas (Deutsch)
19 - Online Mineral Museum
20 - QUT Mineral Atlas
21 - Ruff.Info
22 - Scandinavian mineral gallery
23 - Tradeshop.com - The Rainbow of Gems
24 - WWW-MINCRYST

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Ask about Dravite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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Print or Cut-and-Paste your Dravite Specimen Label here :

Dravite

NaMg3Al6(BO3)3Si6O18(OH)4
Dana No: 61.03e.01.09 Strunz No: 09.CK.05
Locality:

 

Notes: