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Preiswerkite

A valid IMA mineral species
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09995390014977222715770.jpg
Preiswerkite, etc.

Geisspfad pass, Geisspfad area, Binn, Goms, Valais, Switzerland
05560560014977182366110.jpg
Preiswerkite

Geisspfad area, Binn, Goms, Valais, Switzerland
06214590014977281847771.jpg
Preiswerkite

Geisspfad area, Binn, Goms, Valais, Switzerland
04104110014960865878921.jpg
Preiswerkite, etc.

Geisspfad pass, Geisspfad area, Binn, Goms, Valais, Switzerland
06700610014948673473471.jpg
Preiswerkite

Geisspfad area, Binn, Goms, Valais, Switzerland
05018060014948673511409.jpg
Preiswerkite

Geisspfad area, Binn, Goms, Valais, Switzerland
04516070014963338793220.jpg
Preiswerkite, etc.

Geisspfad pass, Geisspfad area, Binn, Goms, Valais, Switzerland
06700610014948673473471.jpg
Preiswerkite

Geisspfad area, Binn, Goms, Valais, Switzerland
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About PreiswerkiteHide

07507770015038798946418.jpg
Heinrich Preiswerk
Formula:
NaMg2Al(Al2Si2O10)(OH)2
Colour:
Pale green to colourless
Hardness:
2½
Specific Gravity:
2.96
Crystal System:
Monoclinic
Name:
Named by H.R. Keusen and T. Peters in 1980 in honor of Heinrich Preiswerk (19 May 1876 - 24 March 1940), professor in Basel, Switzerland. He spent 30 years mapping the Simplon-Binntal region and the mountains of Ticino.
A relative rare sodic trioctahedral mica.


Unique IdentifiersHide

Mindat ID:
3279
Long-form identifier:
mindat:1:1:3279:3
GUID
(UUID V4):
73c36f4e-421e-4338-b056-8160ba64f26e

IMA Classification of PreiswerkiteHide

Classification of PreiswerkiteHide

Strunz-mindat (2024):
9.EC.20

9 : SILICATES (Germanates)
E : Phyllosilicates
C : Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
Dana 8th ed.:
71.2.2b.15

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
Hey's CIM Ref.:
16.8.1

16 : Silicates Containing Aluminum and other Metals
8 : Aluminosilicates of Mg and alkalis

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
PwkIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
PwkWarr (2020)Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261–264 doi:10.1180/clm.2020.30

Physical Properties of PreiswerkiteHide

Transparency:
Translucent
Colour:
Pale green to colourless
Hardness:
2½ on Mohs scale
Cleavage:
Perfect
{001}
Density:
2.96 g/cm3 (Measured)    2.94 g/cm3 (Calculated)

Optical Data of PreiswerkiteHide

Type:
Biaxial (-)
RI values:
nα = 1.560(4) nβ = 1.614(2) nγ = 1.615(2)
2V:
Measured: 5° to 7°, Calculated: 14°
Max Birefringence:
δ = 0.055
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v moderate

Chemistry of PreiswerkiteHide

Mindat Formula:
NaMg2Al(Al2Si2O10)(OH)2
Elements listed:
Al, H, Mg, Na, O, Si - search for minerals with similar chemistry
Common Impurities:
Fe,Ca,K,H2O

Chemical AnalysisHide

Oxide wt%:
 1
SiO229.93 %
TiO20.02 %
Al2O335.98 %
Cr2O30.04 %
FeO6.98 %
MnO0.04 %
CaO0.16 %
MgO14.78 %
BaO0.11 %
Na2O7.02 %
K2O0.06 %
F0.041 %
Cl0.006 %
Total:95.167 %
Sample references:
IDLocalityReferenceNotes
1Liset eclogite pod, Liset, Selje, Stad, Vestland, Norway
Godard, G. and Smith, D. (1999) Preiswerkite and Na-(Mg,Fe)-margarite in eclogites. Contributions to Mineralogy and Petrology 136 (1-2): 20-32
Analyzed with a Cameca SX-50 electronmicroprobe at the University of Paris 7.

Crystallography of PreiswerkiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 5.228(7) Å, b = 9.049(10) Å, c = 9.819(12) Å
β = 100.41°
Ratio:
a:b:c = 0.578 : 1 : 1.085
Unit Cell V:
456.87 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Common about [310]

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0001620PreiswerkiteOberti R, Ungaretti L, Tlili A, Smith D C, Robert J-L (1993) The crystal structure of preiswerkite American Mineralogist 78 1290-129819930293
0001621PreiswerkiteOberti R, Ungaretti L, Tlili A, Smith D C, Robert J-L (1993) The crystal structure of preiswerkite American Mineralogist 78 1290-129819930293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.64 Å(50)
4.52 Å(60)
3.215 Å(50)
2.572 Å(100)
2.457 Å(70)
2.149 Å(60)
1.508 Å(100)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
37 : Layered igneous intrusions and related PGE minerals
Stage 5: Initiation of plate tectonics<3.5-2.5
40 : Regional metamorphism (greenschist, amphibolite, granulite facies)

Type Occurrence of PreiswerkiteHide

Type Locality:
ⓘ Geisspfad pass, Geisspfad area, Binn, Goms, Valais, Switzerland
General Appearance of Type Material:
Crystals are platy, to 1 mm.
Place of Conservation of Type Material:
Natural History Museum, Bern, Switzerland, B2548.
The Natural History Museum, London, England, 1982,455.
Geological Setting of Type Material:
rodingite dike
Associated Minerals at Type Locality:
Zoisite
Reference:
Keusen, H.R., Peters, T. (1980) Preiswerkite, an Al-rich trioctahedral sodium mica from the Geisspfad ultramafic complex (Penninic Alps). American Mineralogist: 65: 1134-1137.
Download:
http://rruff.info/rruff_1.0/uploads/AM65_1134.pdf

Other Language Names for PreiswerkiteHide

Relationship of Preiswerkite to other SpeciesHide

Member of:
Trioctahedral mica Group > Mica Group
Other Members of this group:
AspidoliteNaMg3(AlSi3O10)(OH)2Mon. 2/m : B2/m
BalestraiteKLi2V5+Si4O12Mon. 2 : B2
BiotiteK(Fe2+/Mg)2(Al/Fe3+/Mg/Ti)([Si/Al/Fe]2Si2O10)(OH/F)2
EphesiteNaLiAl2(Al2Si2O10)(OH)2Tric. 1 : P1
GarmiteCsLiMg2(Si4O10)F2Mon.
HendricksiteKZn3(Si3Al)O10(OH)2Mon. 2/m : B2/m
KreiteriteCsLi2Fe3+(Si4O10)F2Mon.
LepidoliteA Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series.Mon.
Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon. 2 : B2
NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
OrloviteKLi2Ti(Si4O10)OFMon. 2 : B2
PolylithioniteKLi2Al(Si4O10)(F,OH)2Mon. 2/m : B2/b
ShirokshiniteK(NaMg2)(Si4O10)F2Mon. 2/m : B2/m
ShirozuliteKMn2+3(Si3Al)O10(OH)2Mon. 2/m : B2/m
SokolovaiteCsLi2Al(Si4O10)F2Mon.
Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
TainioliteKLiMg2(Si4O10)F2Mon. 2/m : B2/m
TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2Mon. 2/m : B2/b
Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4Mon. 2/m : B2/m
ZinnwalditeMica Group.

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Preiswerkite associated with PargasiteNaCa2(Mg4Al)(Si6Al2)O22(OH)2
3 photos of Preiswerkite associated with Zoisite(CaCa)(AlAlAl)O[Si2O7][SiO4](OH)
3 photos of Preiswerkite associated with Magnesiotaramite{Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2
3 photos of Preiswerkite associated with RubyAl2O3

Related Minerals - Strunz-mindat GroupingHide

9.EC.BalestraiteKLi2V5+Si4O12Mon. 2 : B2
9.EC.MeifuiteKFe6(Si7Al)O19(OH)4Cl2Tric. 1 : P1
9.EC.05MinnesotaiteFe2+3Si4O10(OH)2Tric. 1 : P1
9.EC.05TalcMg3Si4O10(OH)2Tric. 1 : P1
9.EC.05WillemseiteNi3Si4O10(OH)2Mon.
9.EC.9.EC.VoloshiniteRb(LiAl1.5◻0.5)(Al0.5Si3.5)O10F2Mon. 2/m : B2/b
9.EC.10FerripyrophylliteFe3+Si2O5(OH)Mon. 2/m
9.EC.10PyrophylliteAl2Si4O10(OH)2Tric. 1
9.EC.10LuanshiweiiteKLiAl1.5(Si3.5Al0.5)O10(OH)2Mon. 2/m : B2/b
9.EC.10FluorluanshiweiiteKLiAl1.5(Si3.5Al0.5)O10F2Mon. 2/m : B2/m
9.EC.10ManganiceladoniteK(MgMn3+◻)(Si4O10)(OH)2Mon.
9.EC.10GarmiteCsLiMg2(Si4O10)F2Mon.
9.EC.10GorbunoviteCsLi2(Ti,Fe)Si4O10(F,OH,O)2Mon.
9.EC.15BoromuscoviteKAl2(BSi3O10)(OH)2Mon. 2/m
9.EC.15CeladoniteK(MgFe3+◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2Mon.
9.EC.15Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4Mon. 2/m : B2/m
9.EC.15MuscoviteKAl2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15NanpingiteCsAl2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b
9.EC.15ParagoniteNaAl2(AlSi3O10)(OH)2Mon.
9.EC.15RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15Tobelite(NH4,K)Al2(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.15AluminoceladoniteK(MgAl◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2Mon. 2/m : B2/b
9.EC.15FerroaluminoceladoniteK(Fe2+Al◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15FerroceladoniteK(Fe2+Fe3+◻)(Si4O10)(OH)2Mon. 2/m : B2/m
9.EC.15ChromceladoniteK(MgCr◻)(Si4O10)(OH)2Mon. 2 : B2
9.EC.15TainioliteKLiMg2(Si4O10)F2Mon. 2/m : B2/m
9.EC.15Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2Mon. 2/m : B2/b
9.EC.15UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2Mon.
9.EC.15KreiteriteCsLi2Fe3+(Si4O10)F2Mon.
9.EC.20AnniteKFe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20EphesiteNaLiAl2(Al2Si2O10)(OH)2Tric. 1 : P1
9.EC.20HendricksiteKZn3(Si3Al)O10(OH)2Mon. 2/m : B2/m
9.EC.20Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2Mon. 2 : B2
9.EC.20NorrishiteKLiMn3+2(Si4O10)O2Mon. 2/m : B2/m
9.EC.20PhlogopiteKMg3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20PolylithioniteKLi2Al(Si4O10)(F,OH)2Mon. 2/m : B2/b
9.EC.20SiderophylliteKFe2+2Al(Al2Si2O10)(OH)2Mon.
9.EC.20TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2Mon. 2/m : B2/m
9.EC.20FluorotetraferriphlogopiteKMg3(Fe3+Si3O10)F2Mon. 2/m : B2/m
9.EC.20Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4Mon. 2/m : B2/m
9.EC.20EastoniteKMg2Al(Al2Si2O10)(OH)2Mon.
9.EC.20TetraferrianniteKFe2+3(Si3Fe3+)O10(OH)2Mon. 2/m : B2/m
9.EC.20TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2Mon. 2/m : B2/b
9.EC.20FluoranniteKFe2+3(Si3Al)O10F2Mon. 2/m : B2/m
9.EC.20ShirokshiniteK(NaMg2)(Si4O10)F2Mon. 2/m : B2/m
9.EC.20ShirozuliteKMn2+3(Si3Al)O10(OH)2Mon. 2/m : B2/m
9.EC.20SokolovaiteCsLi2Al(Si4O10)F2Mon.
9.EC.20AspidoliteNaMg3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20FluorophlogopiteKMg3(Si3Al)O10F2Mon. 2/m : B2/m
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe2+3(AlSi3O10)(OH)2Mon. 2/m : B2/m
9.EC.20YangzhumingiteKMg2.5(Si4O10)F2Mon. 2/m : B2/m
9.EC.20OrloviteKLi2Ti(Si4O10)OFMon. 2 : B2
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2Mon. 2/m : B2/m
9.EC.20Chloroferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(Cl,OH,F)2
9.EC.22PimeliteNi3Si4O10(OH)2 · 4H2OHex.
9.EC.30Chlorophaeite(Ca,Mg,Fe)2Fe2Si4O13 · 10H2O
9.EC.30MargariteCaAl2(Al2Si2O10)(OH)2Mon. 2/m : B2/b
9.EC.35Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2Mon. 2/m : B2/b
9.EC.35BityiteCaLiAl2(AlBeSi2O10)(OH)2Mon. 2/m : B2/b
9.EC.35ClintoniteCaAlMg2(SiAl3O10)(OH)2Mon. 2/m : B2/m
9.EC.35Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2Mon. 2/m : B2/m
9.EC.35Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2Mon. 2/m : B2/m
9.EC.35Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2Mon. 2/m : B2/m
9.EC.35FluorokinoshitaliteBaMg3(Al2Si2O10)F2Mon. 2/m : B2/m
9.EC.40Beidellite(Na,Ca0.5)0.3Al2((Si,Al)4O10)(OH)2 · nH2OMon. 2/m : B2/m
9.EC.40Kurumsakite(Zn,Ni,Cu)8Al8V5+2Si5O35 · 27H2O (?)Orth.
9.EC.40Montmorillonite(Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2OMon. 2/m : B2/m
9.EC.40NontroniteNa0.3Fe2((Si,Al)4O10)(OH)2 · nH2OMon. 2/m : B2/m
9.EC.40VolkonskoiteCa0.3(Cr,Mg,Fe)2((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.40Yakhontovite(Ca,Na)0.5(Cu,Fe,Mg)2(Si4O10)(OH)2 · 3H2OMon.
9.EC.45HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2Mon. 2/m : B2/m
9.EC.45SaponiteCa0.25(Mg,Fe)3((Si,Al)4O10)(OH)2 · nH2OMon.
9.EC.45SauconiteNa0.3Zn3((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.45SpadaiteMgSiO2(OH)2 · H2O (?)
9.EC.45Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2Mon.
9.EC.45SwineforditeLi(Al,Li,Mg)3((Si,Al)4O10)2(OH,F)4 · nH2OMon. 2/m : B2/m
9.EC.45ZincsiliteZn3Si4O10(OH)2 · 4H2O (?)Mon.
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3((Si,Al)4O10)(OH)2 · 4H2OMon.
9.EC.45HanjiangiteBa2CaV3+Al(H2AlSi3O12)(CO3)2FMon. 2 : B2
9.EC.50VermiculiteMg0.7(Mg,Fe,Al)6(Si,Al)8O20(OH)4 · 8H2OMon. 2/m
9.EC.52Tarasovitenear NaKAl11Si13O40(OH)9 · 3H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8Tric. 1
9.EC.55Chamosite(Fe2+)5Al(Si,Al)4O10(OH,O)8Mon. 2/m : B2/m
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8Mon. 2/m : B2/m
9.EC.55Cookeite(LiAl4◻)[AlSi3O10](OH)8Mon. 2/m
9.EC.55FranklinfurnaceiteCa2Fe3+Mn2+3Mn3+(Zn2Si2O10)(OH)8Mon. 2 : B2
9.EC.55Gonyerite(Mn2+,Mg)5Fe3+(Fe3+Si3O10)(OH)8Orth.
9.EC.55Nimite(Ni,Mg,Al)6((Si,Al)4O10)(OH)8Mon. 2/m : B2/m
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55PennantiteMn2+5Al(AlSi3O10)(OH)8Tric.
9.EC.55SudoiteMg2Al3(Si3Al)O10)(OH)8Mon. 2/m : B2/m
9.EC.55DonbassiteAl4.33(Si3Al)O10(OH)8Mon. 2 : B2
9.EC.55GlagoleviteNa(Mg,Al)6(AlSi3O10)(OH,O)8Tric. 1 : P1
9.EC.55Borocookeite(LiAl4◻)[BSi3O10](OH)8Mon. m : Bb
9.EC.60AliettiteCa0.2Mg6((Si,Al)8O20)(OH)4 · 4H2OMon.
9.EC.60Corrensite(Mg,Fe)9((Si,Al)8O20)(OH)10 · nH2OOrth.
9.EC.60DozyiteMg7Al2(Al2Si4O15)(OH)12Mon.
9.EC.60HydrobiotiteK(Mg,Fe2+)6((Si,Al)8O20)(OH)4 · nH2OMon. 2/m : B2/m
9.EC.60Karpinskite(Ni,Mg)2Si2O5(OH)2 (?)Mon.
9.EC.60KulkeiteMg8Al(AlSi7O20)(OH)10Mon.
9.EC.60LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10Mon.
9.EC.60Rectorite(Na,Ca)Al4((Si,Al)8O20)(OH)4 · 2H2OMon.
9.EC.60Saliotite(Li,Na)Al3(AlSi3O10)(OH)5Mon. 2/m : B2/m
9.EC.60TosuditeNa0.5(Al,Mg)6((Si,Al)8O18)(OH)12 · 5H2OMon. 2 : B2
9.EC.60BrinrobertsiteNa0.3Al4(Si4O10)2(OH)4 · 3.5 H2OMon.
9.EC.65Macaulayite(Fe,Al)24Si4O43(OH)2Mon.
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6Trig. 3m (3 2/m) : P3 1m
9.EC.75Ferrisurite(Pb,Ca)2.4Fe3+2(Si4O10)(CO3)1.7(OH)3 · nH2OMon.
9.EC.75Surite(Pb,Ca)3(Al,Fe2+,Mg)2((Si,Al)4O10)(CO3)2(OH)2Mon. 2 : P21
9.EC.75Niksergievite(Ba,Ca)2Al3(AlSi3O10)(CO3)(OH)6 · nH2OMon.
9.EC.80KegelitePb8Al4(Si8O20)(SO4)2(CO3)4(OH)8Mon.

Other InformationHide

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

Internet Links for PreiswerkiteHide

References for PreiswerkiteHide

Localities for PreiswerkiteHide

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 ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Botswana
 
  • North-East District
Godard et al. (1999)
China
 
  • Anhui
    • Anqing
      • Yuexi County
 ...
France
 
  • Pays de la Loire
    • Loire-Atlantique
      • Nantes
        • Saint-Philbert-de-Grand-Lieu
Mposkos et al. (2012)
Greece
 
  • Eastern Macedonia and Thrace
    • Rhodope
      • Arriana
Mposkos et al. (2012)
Guatemala
 
  • Motagua Valley
Mikhail Ostrooumov and Alfredo Victoria Morales (2010)
  • Zacapa Department
Godard et al. (1999)
Japan
 
  • Niigata Prefecture
ID by Dr. Miyajima
Norway
 
  • Agder
    • Froland
Visser et al. (1999)
  • Vestland
    • Stad
      • Selje
        • Liset
Smith et al. (1983) +1 other reference
Switzerland (TL)
 
  • Valais
    • Goms
      • Binn
        • Geisspfad area
Keusen et al. (1980) +1 other reference
    • Visp
      • Saas-Almagell
Stalder et al. (1998)
Godard et al. (1999)
USA
 
Leonard S.Wiener and Sigrid Ballew
    • Clay County
      • Buck Creek
Genth
Dana (1892)
    • Macon County
      • Cowee Valley
        • Ellijay Mining District
          • Franklin
            • Corundum Hill
Genth F.A
Vietnam
 
  • Yên Bái Province
    • Lục Yên District
Krivovichev et al. (2022)
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