Foitite Mineral Data + Say FOITITE

General Foitite Information

Help on Chemical  Formula: Chemical Formula: [ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4
Help on Composition: Composition: Molecular Weight = 1,031.73 gm
   Sodium     2.23 %  Na    3.00 % Na2O
   Aluminum  17.65 %  Al   33.35 % Al2O3
   Iron      12.18 %  Fe   17.41 % Fe2O3
   Silicon   16.33 %  Si   34.94 % SiO2
   Boron      3.14 %  B    10.12 % B2O3
   Hydrogen   0.39 %  H     3.49 % H2O
   Oxygen    48.07 %  O
            ______        ______ 
            100.00 %      102.33 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaFe3+2.25Al6.75Si6O18(BO3)3(OH)4
Help on Environment: Environment: Late-stage granitic pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1993 (Dana # Changed)
Help on Locality: Locality: White Queen mine, Pala, San Diego County, California, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Ranklin F. Foit, Jr. (1942-), mineralogist, Washington State Univerisity, Washington, USA.
Help on Synonym: Synonym: Foitite - (61.3.1.1)
  ICSD 74012
  IMA1992-034
  PDF 46-1460
  Tourmaline
 

Foitite Image

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Foitite

Comments: Dark greenish-black termination of foitite on pinkish elbaite.
Location: Dobra Voda, Moravia, Zapadocesky, Czech Republic. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Foitite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.44629
Help on Cell Dimensions: Cell Dimensions: a = 15.967, c = 7.126, Z = 3; V = 1,573.34 Den(Calc)= 3.27
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): 2.573(1), 3.452(0.91), 6.338(0.84),
Click Here for Large Foitite Structure Window Crystal Structure:

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MacDonald D J , Hawthorne F C , Grice J D , American Mineralogist , 78 (1993) p.1299-1303

View Additional jPOWD Structure files for Foitite
[1] [2]
 

Physical Properties of Foitite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bluish black.
Help on Density: Density: 3.17
Help on Diaphaniety: Diaphaniety: Translucent to Opaque
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 Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: gray white
 

Optical Properties of Foitite

Help on Dichroism (e): Dichroism (e): dark blue.
Help on Dichroism (w): Dichroism (w): pale lavender.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.154 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1997,KPDmeas= 0.206,KC= 0.2359
Help on Optical Data: Optical Data: Uniaxial (-), e=1.642, w=1.664, bire=0.0220.
 

Calculated Properties of Foitite

Help on Electron Density: Electron Density:

relectron=3.12 gm/cc
note: rFoitite =3.17 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.01669
Boson Index = 0.98331
Help on Photoelectric: Photoelectric:

PEFoitite = 4.82 barns/electron
U=PEFoitite x relectron= 15.04 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Foitite is Not Radioactive

 

Foitite Classification

Help on  Dana Class: Dana Class: 61.3a.1.1 (61)Cyclosilicate Six-Membered Rings
  (61.3a)with borate groups (Alkali-Deficient Tourmaline Subgroup)
  (61.3a.1)Dana Group
 
61.3a.1.1 Foitite ! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
 
61.3a.1.2 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
61.3a.1.3 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
Help on  Strunz Class: Strunz Class: VIII/E.19-55 VIII - Silicates
  VIII/E - Cyklosilicates, six rings [Si6O18]12-
  VIII/E.19 - Tourmaline group
 
VIII/E.19-05 Rossmanite! []LiAl2Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
VIII/E.19-10 Elbaite Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
VIII/E.19-15 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
VIII/E.19-20 Dravite NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
VIII/E.19-30 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
VIII/E.19-35 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
 
VIII/E.19-50 Schorl NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
VIII/E.19-55 Foitite []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
 
VIII/E.19-60 Olenite! NaAl3Al6(BO3)3(Si6O18)(O,OH)4 R 3m 3m
 
VIII/E.19-70 Buergerite! NaFe3Al6(BO3)3Si6O21F R 3m 3m
 
VIII/E.19-75 Povondraite! (Na,K)(Fe,Fe)3(Fe,Mg,Al)6(BO3)3Si6O18(OH)4 R 3m 3m
 
VIII/E.19-80 Liddicoatite! Ca(Li,Al)3Al6(BO3)3Si6O18(O,OH,F)4 R 3m 3m
 
VIII/E.19-90 Uvite (Ca,Na)(Mg,Fe)3Al5Mg(BO3)3Si6O18(OH,F)4 R 3m 3m
 
VIII/E.19-100 Feruvite! (Ca,Na)(Fe,Mg,Ti)3(Al,Mg,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 

Other Foitite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,78:1299) OPTIC PROP.(Am.Min.,Vol.78,p1299-1303,1993)
Help on See Also: See Also: Links to other databases for Foitite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (MinSocAm) 8 -Handbook of Mineralogy (UofA) 9 -MinDAT 10 -MinMax(Deutsch) 11 -MinMax(English) 12 -Mineralienatlas (Deutsch) 13 -QUT Mineral Atlas 14 - WWW-MINCRYST 15 -École des Mines de Paris

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Foitite

[ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4
Dana No: 61.3a.1.1 Strunz No: VIII/E.19-55
Locality:

 

Notes:

 

 
   
 
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