Schorl Mineral Data + Say SCHORL

General Schorl Information
Help on Chemical Formula: Chemical Formula: NaFe++3Al6(BO3)3Si6O18(OH)4
Help on Composition: Composition: Molecular Weight = 1,053.38 gm
   Sodium     2.18 %  Na    2.94 % Na2O
   Aluminum  15.37 %  Al   29.04 % Al2O3
   Iron      15.91 %  Fe   20.47 % FeO
   Silicon   16.00 %  Si   34.22 % SiO2
   Boron      3.08 %  B     9.91 % B2O3
   Hydrogen   0.38 %  H     3.42 % H2O
   Oxygen    47.08 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaFe2+3Al6(BO3)3Si6O18(OH)4
Help on Environment: Environment: Granites, diorites, gabbro pegmatites, greisens, skarns and quartz veins.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1524 (Dana # Changed)
Help on Locality: Locality: Sonnenberg, Bodenmais and Spessart, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Old name of unknown origin.
Help on Synonym: Synonym: ICSD 74180
  PDF 43-1464
  Schorl - (61.3.1.10)
  Tourmaline
 

Schorl Image

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Schorl   Albite

Comments: Several jet-black lustrous crystals of schorl perched on a white albite matrix.
Location: Shengus, Gilgit, Pakistan. Scale: 4 x 3 x 2 cm.
© Isaias Casanova / IC Minerals
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Schorl

Comments: Parallel grouping of sharp, black schorl crystals showing terminations.
Location: Davib Ost, Erongo Mountains Namibia. Scale: Crystal size: 1.7 x 1.4 cm.
© Fabre Minerals

Schorl Crystallography
Help on Axial Ratios: Axial Ratios: a:c = 1:0.44996
Help on Cell Dimensions: Cell Dimensions: a = 15.99, c = 7.195, Z = 3; V = 1,593.16 Den(Calc)= 3.29
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): 2.576(1), 2.961(0.85), 3.99(0.85),
Help on Forms: Forms:

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Forms: [ 0 2 1] [ 1 0 1] [ 1 2 0] [ 1 0 0] [ 1 0 1] [ 0 2 1]

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Bloodaxe E S , Hughes J M , Dyar M D , Grew E S , Guidotti C V , American Mineralogist , 84 (1999) p.922-928, Linking structure and chemistry in the schorl-dravite series, Sample 108749

View Additional jPOWD Structure files for Schorl
[1] [2] [3] [4] [5] [6] [7] [8]
 

Physical Properties of Schorl

Help on Cleavage: Cleavage: [1011] Indistinct
Help on Color: Color: Black, Brownish black, Greenish black, Bluish black.
Help on Density: Density: 3.1 - 3.2, Average = 3.15
Help on Diaphaniety: Diaphaniety: Opaque
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 Luminescence: Luminescence: Piezoelectric.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: brown
 

Optical Properties of Schorl

Help on Dichroism (e): Dichroism (e): light brown, buff, or light gray.
Help on Dichroism (w): Dichroism (w): dark brown, black, or deep gray.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.144 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.18 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1979,KPDmeas= 0.2067,KC= 0.2415
Help on Optical Data: Optical Data: Uniaxial (-), e=1.633-1.64, w=1.66-1.672, bire=0.0270-0.0320.
 

Calculated Properties of Schorl

Help on Electron Density: Electron Density:

relectron=3.10 gm/cc
note: rSchorl =3.15 gm/cc.
Help on Fermion Index Fermion Index Fermion Index = 0.01719
Boson Index = 0.98281
Help on Photoelectric: Photoelectric:

PESchorl = 5.85 barns/electron
U=PESchorl x relectron= 18.11 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Schorl is Not Radioactive
 

Schorl Classification
Help on Dana Class: Dana Class: 61.3e.1.10 (61)Cyclosilicate Six-Membered Rings
  (61.3e)with borate groups (Sodic Tourmaline Subgroup)
  (61.3e.1)Dana Group
 
61.3e.1.9 Dravite! NaMg3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.3e.1.10 Schorl ! NaFe3Al6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.3e.1.11 Chromdravite! NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4 R 3m 3m
 
61.3e.1.12 Vanadiumdravite! NaMg3V6(Si6O18)(BO3)3(OH)4 R 3m 3m
Help on Strunz Class: Strunz Class: VIII/E.19-50 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 Schorl Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Schorl :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 - Amethyst Galleries' Mineral Gallery 5 - Applied Mineralogy 6 -Athena 7 - CalTech Mineral Spectroscopy 8 - EUROmin Project 9 - Franklin Minerals(Dunn) 10 -Google Images 11 -Google Scholar 12 -Handbook of Mineralogy (MinSocAm) 13 -Handbook of Mineralogy (UofA) 14 -MinDAT 15 -MinMax(Deutsch) 16 -MinMax(English) 17 - Mineral and Gemstone Kingdom 18 -Mineralienatlas (Deutsch) 19 - Minerals of Wisconsin 20 -QUT Mineral Atlas 21 - Scandinavian mineral gallery 22 - WWW-MINCRYST 23 - YupRocks 24 -École des Mines de Paris

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Schorl

NaFe++3Al6(BO3)3Si6O18(OH)4
Dana No: 61.3e.1.10 Strunz No: VIII/E.19-50
Locality:

 

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