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Foitite Mineral Data

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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 Franklin F. Foit, Jr. (1942-), mineralogist, Washington State Univerisity, Washington, USA.
Help on Name Pronunciation: Name Pronunciation: Foitite Say FOITITE
Help on Synonym: Synonym: Foitite - (
  ICSD 74012
  PDF 46-1460

Foitite Image

Click Here for Larger   Image in a New Browser Window Images:
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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 Pyramidal H-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),

Physical Properties of Foitite

Help on Cleavage: Cleavage: None
Help on Color: Color: Bluish black.
Help on Density: Density: 3.17
Help on Diaphaneity: Diaphaneity: 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
Ncalc = 1.75 - 1.77
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: Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Foitite =3.17 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEFoitite = 4.82 barns/electron
U=PEFoitite x rElectron Density= 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: 61.03a.01.01 (61)Cyclosilicate Six-Membered Rings
  (61.03a)with borate groups (Alkali-Deficient Tourmaline Subgroup)
  (61.03a.01)Foitite Subgroup
61.03a.01.01 Foitite! []Na<0.5(Fe,Al)3Al6Si6O18(BO3)3(OH)4 R 3m 3m
61.03a.01.02 Magnesiofoitite! [](Mg2Al)Al6(Si6O18)(BO3)3(OH)4 R 3m 3m
61.03a.01.03 Rossmanite! []LiAl2Al6(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 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 - 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

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Print or Cut-and-Paste your Foitite Specimen Label here :


[ ]Na<0.5(Fe++,Al)3Al6Si6O18(BO3)3(OH)4
Dana No: 61.03a.01.01 Strunz No: 09.CK.05





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