Povondraite Mineral Data

Povondraite Mineral Data
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General Povondraite Information

Help on Chemical Formula: Chemical Formula: (Na,K)(Fe+++,Fe++)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4
Help on Composition: Composition: Molecular Weight = 1,156.50 gm
   Potassium   0.85 %  K     1.02 % K2O
   Sodium      1.49 %  Na    2.01 % Na2O
   Magnesium   3.78 %  Mg    6.27 % MgO
   Aluminum    1.40 %  Al    2.64 % Al2O3
   Iron       31.87 %  Fe   27.02 % FeO / 15.53 % Fe2O3
   Silicon    14.57 %  Si   31.17 % SiO2
   Boron       2.80 %  B     9.03 % B2O3
   Hydrogen    0.35 %  H     3.12 % H2O
   Oxygen     42.89 %  O
             ______        ______ 
             100.00 %       97.82 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.75K0.25Fe3+2.25Fe2+0.75Fe2+3.6Mg1.8Al0.6(BO3)3(Si6O18)(OH)4
Help on Environment: Environment: Found in hydrothermally altered basalt clasts in a metamorphosed evaporite deposit.
Help on IMA Status: IMA Status: Approved IMA 1993 (Dana # Changed)
Help on Locality: Locality: Cristalmuya gorge, near San Francisco asbestos mine, Chapare Province, Cochabamba Department, Bolivia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pavel Povandra (1924-), mineralogits, Charles University, Prague, Czech Repubic.
Help on Name Pronunciation: Name Pronunciation: Povondraite + Pronunciation Say POVONDRAITE
Help on Synonym: Synonym: Ferridravite
  ICSD 72941
  IMA1978-075
  PDF 33-1261
  Povondraite - (61.3.1.6)
  Tourmaline
 

Povondraite Image

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Povondraite

Comments: Deep greenish black povondraite crystals.
Location: Malacacheta, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Povondraite Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.4599
Help on Cell Dimensions: Cell Dimensions: a = 16.186, c = 7.444, Z = 3; V = 1,688.95 Den(Calc)= 3.41
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): 2.63(1), 4.05(0.9), 6.63(0.9),
Click Here for Large Povondraite Structure Window Crystal Structure:

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Grice J D , Ercit T S , Hawthorne F C , American Mineralogist , 78 (1993) p.433-436, Povondraite, a redefinition of the tourmaline ferridravite, Note: Atomic parameters updated by Grice on 11/20/2001.

 

Physical Properties of Povondraite

Help on Cleavage: Cleavage: None
Help on Color: Color: Black.
Help on Density: Density: 3.26
Help on Diaphaneity: Diaphaneity: Translucent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Striated - Parallel lines on crystal surface or cleavage face.
Help on Hardness: Hardness: 7 - Quartz
Help on Luster: Luster: Resinous
Help on Streak: Streak: brown
 

Optical Properties of Povondraite

Help on Dichroism (e): Dichroism (e): light brown or light brown.
Help on Dichroism (w): Dichroism (w): brown or opaque.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.103 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.055 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2304,KPDmeas= 0.241,KC= 0.2184
Ncalc = 1.71 - 1.74
Help on Optical Data: Optical Data: Uniaxial (-), e=1.751, w=1.82, bire=0.0690.
 

Calculated Properties of Povondraite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Povondraite =3.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEPovondraite = 10.33 barns/electron
U=PEPovondraite x relectron= 34.43 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 11.91 (Gamma Ray American Petroleum Institute Units)
Concentration of Povondraite per GRapi unit = 8.40 (%)

Estimated Radioactivity from Povondraite - barely detectable

 

Povondraite Classification
Help on Dana Class: Dana Class: 61.03c.01.06 (61)Cyclosilicate Six-Membered Rings
  (61.03c)with borate groups (Ferric Tourmaline Subgroup)
  (61.03c.01)Buergerite Subgroup
 
61.03c.01.05 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
 
61.03c.01.06 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(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 Povondraite Information
Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.78,p433-436,1993) OPTIC PROP.(Am.Min.,Vol.78,p433-436,1993)
Help on See Also: See Also: Links to other databases for Povondraite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Povondraite

(Na,K)(Fe+++,Fe++)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4
Dana No: 61.03c.01.06 Strunz No: 09.CK.05
Locality:

 

Notes: