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Schorl-(F) Mineral Data

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General Schorl-(F) Information

Help on Chemical  Formula: Chemical Formula: NaFe++3Al6Si6O18)(BO3)3(OH)3(F,OH)
Help on Composition: Composition: Molecular Weight = 1,028.43 gm
   Potassium   0.04 %  K     0.05 % K2O
   Sodium      1.74 %  Na    2.35 % Na2O
   Magnesium   0.05 %  Mg    0.08 % MgO
   Titanium    0.09 %  Ti    0.16 % TiO2
   Manganese   0.69 %  Mn    0.90 % MnO
   Aluminum   16.84 %  Al   31.82 % Al2O3
   Zinc        0.13 %  Zn    0.16 % ZnO
   Iron       12.38 %  Fe   13.20 % FeO /  3.03 % Fe2O3
   Silicon    16.11 %  Si   34.47 % SiO2
   Boron       3.15 %  B    10.15 % B2O3
   Hydrogen    0.32 %  H     2.84 % H2O
   Oxygen     47.04 %  O
   Fluorine    1.40 %  F     1.40 % F
                -   %   F    -0.59 % -O=F2    
             ______        ______ 
             100.00 %      100.02 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Na0.78K0.01Fe2+1.89Al0.58Fe3+0.13Mn2+0.13Ti0.02Mg0.02Zn0.02Al5.74Fe3+0.26Si5.9 Al0.1O18(BO3)3(OH)3F0.76(OH)0.24
Help on Environment: Environment: Pegmatites.
Help on IMA Status: IMA Status: Not Submitted IMA (Dana # Added)
Help on Locality: Locality: Grasstein, Sachsenklemme, Trentino, South Tyrol, Italy, in pegmatites from the Permian Brixener granite. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as the F analog of the hydroxyl end-member schorl, in the tourmaline group.
Help on Name Pronunciation: Name Pronunciation: Schorl-(F) Say SCHORL-(F)
Help on Synonym: Synonym: Tourmaline

Schorl-(F) Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.44877
Help on Cell Dimensions: Cell Dimensions: a = 15.997, c = 7.179, Z = 3; V = 1,591.01 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3m

Physical Properties of Schorl-(F)

Help on Color: Color: Pale brown, Pale grayish blue.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
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: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown

Optical Properties of Schorl-(F)

Help on Optical Data: Optical Data: Uniaxial (-).
  NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.2114) where Ncalc=Dcalc*KC+1

Calculated Properties of Schorl-(F)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Schorl-(F) =3.22 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PESchorl-(F) = 5.11 barns/electron
U=PESchorl-(F) x relectron= 16.18 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 0.56 (Gamma Ray American Petroleum Institute Units)
Concentration of Schorl-(F) per GRapi unit =177.97 (%)

Estimated Radioactivity from Schorl-(F) - barely detectable


Schorl-(F) Classification

Help on  Dana Class: Dana Class: 61.03e.01.10a (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 Schorl-(F) Information

Help on References: References: NAME( AmMin, v92:1539) PHYS. PROP.(AmMin, v92:1539) OPTIC PROP.(AmMin, v92:1539)
Help on See Also: See Also: Links to other databases for Schorl-(F) :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: 61.03e.01.10a Strunz No: 09.CK.05





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