Schorl Mineral Data (original) (raw)

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 20.46 % 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 from 61.3.1.10)

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 Name Pronunciation: Name Pronunciation:

Schorl Say SCHORL

Help on Synonym: Synonym:

ICSD 74180

PDF 43-1464

Tourmaline

Schorl Image

Click Here for Larger Schorl Image in a New Browser Window Images:

Click Here for Larger Schorl Image in a New Browser Window Images:

Click Here for Larger Schorl Image 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) Warning: this large pop-up is very compute intensive and may not work well with some computers. | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |

Click Here for Large Schorl Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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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 Diaphaneity: Diaphaneity:

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= 0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1979,KPDmeas= 0.2067,KC= 0.2083
Ncalc = 1.65 - 1.69

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:

Bulk Density (Electron Density)=3.10 gm/cc
note: Specific Gravity of Schorl =3.15 gm/cc.

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

PESchorl = 5.85 barns/electron
U=PESchorl x rElectron Density= 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:

61.03e.01.10 (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 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 - Athena
6 - CalTech Mineral Spectroscopy
7 - EUROmin Project
8 - Ecole des Mines de Paris
9 - Franklin Minerals(Dunn)
10 - GeoScienceWorld
11 - Google Images
12 - Google Scholar
13 - Handbook of Mineralogy (MinSocAm)
14 - Handbook of Mineralogy (UofA)
15 - MinDAT
16 - Mineral and Gemstone Kingdom
17 - Mineralienatlas (Deutsch)
18 - Online Mineral Museum
19 - QUT Mineral Atlas
20 - Ruff.Info
21 - Scandinavian mineral gallery
22 - WWW-MINCRYST
23 - YupRocks
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

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Ask about Schorl here :
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Print or Cut-and-Paste your Schorl Specimen Label here :

Schorl

NaFe++3Al6(BO3)3Si6O18(OH)4
Dana No: 61.03e.01.10 Strunz No: 09.CK.05
Locality:

Notes: