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Schorl

A valid IMA mineral species - grandfathered
This page kindly sponsored by Azalea Lee
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About SchorlHide

Formula:
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Colour:
Bluish-black to black, sometimes brownish-black, rarely greenish-black.
Lustre:
Vitreous, Resinous
Hardness:
7
Specific Gravity:
3.18 - 3.22
Crystal System:
Trigonal
Name:
The early history of the mineral schorl shows that the name "Schorl" was in use prior to the year 1400 (AD) because a village known today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or minor variants of this name). This village had a nearby tin mine where, in addition to cassiterite, a lot of black tourmaline was found. First mentioned by Ulrich Rülein von Calw 1505. The first relatively detailed description of schorl with the name "schürl" and its occurrence (various tin mines in the Saxony Ore Mountains) was written by Johannes Mathesius (1504-1565) in 1562 under the title "Sarepta oder Bergpostill". Up to about 1600, additional names used in the German language were "Schurel", "Schörle", and "Schurl". From the 18th century on, the name "Schörl" was mainly used in the German-speaking area. In English, the names "shorl" and "shirl" were used in the 18th century for schorl. In the 19th century the names "common schorl", "schörl", "schorl" and "iron tourmaline" were used in the Anglo-Saxon area (Ertl, 2006).
Dimorph of:
The most common member of the Tourmaline Group.
Elbaite-Schorl Series, Dravite-Schorl Series.
Forms also a series with fluor-schorl, which occurs in F-rich environments.






Unique IdentifiersHide

Mindat ID:
3578
Long-form identifier:
mindat:1:1:3578:7
GUID
(UUID V4):
115ca1d1-3881-44ec-87c5-36da4a046f19

IMA Classification of SchorlHide

Approved, 'Grandfathered' (first described prior to 1959)
First published:
1524

Classification of SchorlHide

9.CK.05

9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.12
61.3.1.10

61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
17.5.44

17 : Silicates Containing other Anions
5 : Borosilicates

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
SrlIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
SrlSiivolam & Schmid (2007)Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
SrlWhitney & Evans (2010)Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
SrlThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of SchorlHide

Vitreous, Resinous
Transparency:
Translucent, Opaque
Colour:
Bluish-black to black, sometimes brownish-black, rarely greenish-black.
Streak:
Greyish-white to bluish-white.
Hardness:
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Very poor on {1120}, {1011}
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
3.18 - 3.22 g/cm3 (Measured)    3.244 g/cm3 (Calculated)

Optical Data of SchorlHide

Type:
Uniaxial (-)
RI values:
nω = 1.660 - 1.672 nε = 1.635 - 1.650
Max Birefringence:
δ = 0.025
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Strong
Comments:
O= yellow brown
E= pale yellow, pale brown
Comments:
May be slightly biaxial under strain.

Chemistry of SchorlHide

Mindat Formula:
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
Common Impurities:
Mn,Mg,Ca,Li,Cr,Ti,F,K

Crystallography of SchorlHide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 15.98(5) Å, c = 7.15(3) Å
Ratio:
a:c = 1 : 0.447
Unit Cell V:
1,581.21 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Prismatic to acicular.
Twinning:
Rarely on {1010} and {4041}.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001229SchorlFoit F F (1989) Crystal chemistry of alkali-deficient schorl and tourmaline structural relationships American Mineralogist 74 422-4311989Jack Creek deposit, near Basin, Montana, USA0293
0002238SchorlBloodaxe E S, Hughes J M, Dyar M D, Grew E S, Guidotti C V (1999) Linking structure and chemistry in the schorl-dravite series Sample 108749 American Mineralogist 84 922-9281999Madagascar0293
0002241SchorlBloodaxe E S, Hughes J M, Dyar M D, Grew E S, Guidotti C V (1999) Linking structure and chemistry in the schorl-dravite series Sample HP2-1 American Mineralogist 84 922-9281999Harney Peak Granite, Custer County, South Dakota, USA0293
0002914SchorlCamara F, Ottolini L, Hawthorne F C (2000) Crystal chemistry of three tourmalines by SREF, EMPA and SIMS American Mineralogist 87 1437-14422000Alto Lighona pegmatite field, Zambezia, Mozambique0293
0003957SchorlBosi F, Andreozzi G B, Federico M, Graziani G, Lucchesi S (2005) Crystal chemistry of the elbaite-schorl series American Mineralogist 90 1784-17922005Cruziero pegmatite, Minas Gerais, Brazil0293
0003958SchorlBosi F, Andreozzi G B, Federico M, Graziani G, Lucchesi S (2005) Crystal chemistry of the elbaite-schorl series American Mineralogist 90 1784-17922005Cruziero pegmatite, Minas Gerais, Brazil0293
0003959SchorlBosi F, Andreozzi G B, Federico M, Graziani G, Lucchesi S (2005) Crystal chemistry of the elbaite-schorl series American Mineralogist 90 1784-17922005Cruziero pegmatite, Minas Gerais, Brazil0293
0005111SchorlFortier S, Donnay G (1975) Schorl refinement showing composition dependence of the tourmaline structure The Canadian Mineralogist 13 173-1771975Andreasberg, Harz, Lower Saxony, Germany0293
0007047SchorlBosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-3442004Bovey Tracy, Devonshire, England0293
0007050SchorlBosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-3442004Cruziero, Minas Gerais, Brazil0293
0007051SchorlBosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-3442004Cruziero, Minas Gerais, Brazil0293
0007056SchorlBosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-3442004Lake Baikal, Siberia0293
0018784SchorlGrice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-2661993Silver Crater, Hastings Co., Ontario, Canada0293
0018786SchorlGrice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-2661993Cross Lake, Manitoba, Canada0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.48 Å(100)
2.587 Å(100)
2.96 Å(93)
6.39 Å(62)
4.01 Å(56)
4.23 Å(55)
2.046 Å(48)
Comments:
Brazil.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4a: Earth’s earliest continental crust>4.4-3.0
19 : Granitic intrusive rocks
Near-surface Processes
23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47)
26 : Hadean detrital minerals
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)
Geological Setting:
In granites and granitic pegmatites, high temperature hydrothermal veins, metamorphic rocks.

Synonyms of SchorlHide

Other Language Names for SchorlHide

Russian:Шерл
Simplified Chinese:铁电气石
黑电气石
Spanish:Chorlo

Varieties of SchorlHide

Magnesium-bearing SchorlA magnesium-bearing schorl; i.e. a Fe-dominant member of the dravite-schorl series.

Relationship of Schorl to other SpeciesHide

Other Members of this group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m (3 2/m) : R3m
Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
Oxy-rossmanite◻(Li0.5Al2.5)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
UM2000-64-SiO:BFeHKMg(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O
UM2008-52-SiO:AlBCaFFeHLiMgNa(Ca,Na,◻)(Al,Li,Fe,Mg)3Al6[Si6O18](BO3)3(OH,O)3(F,O)
Unnamed (F analogue of feruvite)CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F
Unnamed (Pb-analogue of Fluor-liddicoatite)Pb(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
1,443 photos of Schorl associated with QuartzSiO2
1,218 photos of Schorl associated with AquamarineBe3Al2Si6O18
934 photos of Schorl associated with AlbiteNa(AlSi3O8)
808 photos of Schorl associated with MuscoviteKAl2(AlSi3O10)(OH)2
552 photos of Schorl associated with Smoky QuartzSiO2
394 photos of Schorl associated with Feldspar Group
394 photos of Schorl associated with MicroclineK(AlSi3O8)
374 photos of Schorl associated with FluoriteCaF2
341 photos of Schorl associated with CleavelanditeNa(AlSi3O8)
285 photos of Schorl associated with BerylBe3Al2(Si6O18)

Related Minerals - Strunz-mindat GroupingHide

9.CK.Fluor-schorlNaFe2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.DarrellhenryiteNa(Al2Li)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.DutrowiteNa(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Celleriite◻(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.PrincivalleiteNa(Mn2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Alumino-oxy-rossmanite◻Al3Al6(Si5AlO18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Ferro-bosiiteNaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.Magnesio-dutrowiteNa(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-buergeriteNaFe3+3Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
9.CK.05Chromium-draviteNaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05DraviteNaMg3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05FeruviteCaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Foitite◻(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05OleniteNaAl3Al6(Si6O18)(BO3)3O3(OH)Trig. 3m : R3m
9.CK.05PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Magnesio-foitite◻(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Rossmanite◻(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05TsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Oxy-vanadium-draviteNaV3(V4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-draviteNa(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-rossmanite◻(Li0.5Al2.5)Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Luinaite-(OH)NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
9.CK.05Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Chromo-alumino-povondraiteNaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-draviteNaMg3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Unnamed (F analogue of feruvite)CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F
9.CK.05UM2000-64-SiO:BFeHKMg(K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O
9.CK.05Oxy-chromium-draviteNaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Fluor-tsilaisiteNaMn2+3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-chromium-draviteNaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
9.CK.05Fluor-uviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
9.CK.05Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05MaruyamaiteK(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05Oxy-foitite◻(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
9.CK.05Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
9.CK.05Magnesio-lucchesiiteCaMg3Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
9.CK.05UviteCaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
9.CK.05Fluor-rossmanite◻(Al2Li)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m (3 2/m) : R3m
9.CK.10Abenakiite-(Ce)Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)OTrig. 3 : R3
9.CK.15ScawtiteCa7(Si3O9)2CO3 · 2H2OMon. 2/m
9.CK.20Steenstrupine-(Ce)Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 · 2H2OTrig. 3m (3 2/m) : R3m
9.CK.20Thorosteenstrupine(Ca,Th,Mn)3Si4O11F · 6H2O

Other InformationHide

Electrical:
Pyroelectric and piezoelectric.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Schorl in petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

Internet Links for SchorlHide

References for SchorlHide

Reference List:

Localities for SchorlHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

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