Schorl-(F) Mineral Data

General Schorl-(F) Information

Chemical Formula:

NaFe++3Al6Si6O18)(BO3)3(OH)3(F,OH)

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

Empirical Formula:

Na_0.78K_0.01Fe²⁺_1.89Al_0.58Fe³⁺_0.13Mn²⁺_0.13Ti_0.02Mg_0.02Zn_0.02Al_5.74Fe³⁺_0.26Si_5.9 Al_0.1O₁₈(BO₃)₃(OH)₃F_0.76(OH)_0.24

Environment:

Pegmatites.

IMA Status:

Not Submitted IMA (Dana # Added)

Locality:

Grasstein, Sachsenklemme, Trentino, South Tyrol, Italy, in pegmatites from the Permian Brixener granite. Link to MinDat.org Location Data.

Name Origin:

Named as the F analog of the hydroxyl end-member schorl, in the tourmaline group.

Name Pronunciation:

Schorl-(F)

Synonym:

Tourmaline

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Schorl-(F) Crystallography

Axial Ratios:

a:c = 1:0.44877

Cell Dimensions:

a = 15.997, c = 7.179, Z = 3; V = 1,591.01 Den(Calc)= 3.22

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

Physical Properties of Schorl-(F)

Color:

Pale brown, Pale grayish blue.

Diaphaneity:

Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Striated - Parallel lines on crystal surface or cleavage face.

Hardness:

7.5 - Garnet

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Schorl-(F)

Optical Data:

Uniaxial (-).

NCalc= 1.68 - from Gladstone-Dale relationship (KC = 0.2114) where Ncalc=Dcalc*KC+1

Calculated Properties of Schorl-(F)

Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Schorl-(F) =3.22 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Schorl-(F)= 5.11 barns/electron
U=PE_Schorl-(F) x r_electron= 16.18 barns/cc.

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

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

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

References:

NAME( AmMin, v92:1539) PHYS. PROP.(AmMin, v92:1539) OPTIC PROP.(AmMin, v92:1539)

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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Print or Cut-and-Paste your Schorl-(F) Specimen Label here :

Schorl-(F)

NaFe++3Al6Si6O18)(BO3)3(OH)3(F,OH)
Dana No: 61.03e.01.10a Strunz No: 09.CK.05
Locality:

Notes: