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Preiswerkite

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Formula:
NaAlMg2(Si2Al2)O10(OH)2
System:
Monoclinic
Colour:
Pale green to colourless
Hardness:
Member of:

Classification of Preiswerkite

Approved
8/H.11-140
9.EC.20

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

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
2 : Sheets of 6-membered rings with 2:1 layers
16.8.1

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

Physical Properties of Preiswerkite

Colour:
Pale green to colourless
Hardness (Mohs):

Optical Data of Preiswerkite

Type:
Biaxial (-)
RI values:
nα = 1.560 nβ = 1.614 nγ = 1.615
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

Chemical Properties of Preiswerkite

IMA Formula:
NaAlMg2(Si2Al2)O10(OH)2
Elements listed in formula:
Common Impurities:
Fe,Ca,K,H2O

Crystallography of Preiswerkite

Crystal System:
Monoclinic
Cell Parameters:
a = 5.22 Å, b = 9.04 Å, c = 9.81 Å
β = 100.41°
Ratio:
a:b:c = 0.577 : 1 : 1.085
Unit Cell Volume:
V 455.30 ų (Calculated from Unit Cell)

Type Occurrence of Preiswerkite

Relationship of Preiswerkite to other Species

Member of:
Other Members of Group:
AluminoceladoniteK(Mg,Fe2+)Al(Si4O10)(OH)2
Anandite(Ba,K)(Fe2+,Mg)3((Si,Al,Fe)4O10)(S,OH)2
AnniteKFe32+(AlSi3O10)(OH)2
AspidoliteNaMg3(AlSi3O10)(OH)2
BalestraiteKLi2V5+Si4O12
BiotiteA series or subgroup of the Mica Group.
BityiteLiCaAl2(AlBeSi2O10)(OH)2
BoromuscoviteKAl2(BSi3O10)(OH)2
Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
CeladoniteK(Mg,Fe2+)Fe3+(Si4O10)(OH)2
Chernykhite(Ba,Na)(V3+,Al,Mg)2((Si,Al)4O10)(OH)2
ChromceladoniteK(Mg,Fe2+)(Cr,Al)(Si4O10)(OH)2
ChromphylliteK(Cr,Al)2(AlSi3O10)(OH,F)2
ClintoniteCa(Mg,Al)3(Al3SiO10)(OH)2
EastoniteKMg2Al(Al2Si2O10)(OH)2
EphesiteLiNaAl2(Al2Si2O10)(OH)2
FerroaluminoceladoniteK(Fe2+,Mg)(Al,Fe3+)(Si4O10)(OH)2
FerroceladoniteK(Fe2+,Mg)(Fe3+,Al)(Si4O10)(OH)2
Ferrokinoshitalite(Ba,K)(Fe2+,Mg)3(Al2Si2O10)(OH,F)2
FluoranniteKFe32+(AlSi3O10)(F,OH)2
FluorophlogopiteKMg3(AlSi3O10)(F,OH)2
Ganterite(Ba,Na,K)(Al,Mg)2(AlSi3O10)(OH)2
Glauconite(K,Na)(Mg,Fe2+,Fe3+)(Fe3+,Al)(Si,Al)4O10(OH)2
HendricksiteK(Zn,Mg,Mn2+)3(AlSi3O10)(OH)2
IlliteK0.65Al2.0[Al0.65Si3.35O10](OH)2
Kinoshitalite(Ba,K)(Mg,Mn2+,Al)3(Al2Si2O10)(OH)2
LepidoliteA Li-rich mica in, or close to, the so-called Polylithionite-Trilithionite series.
LuanshiweiiteKLiAl1.50.5(Si3.5Al0.5)O10(OH,F)2
ManganiceladoniteKMgMn3+Si4O10(OH)2
MargariteCaAl2(Al2Si2O10)(OH)2
Masutomilite(K,Rb)(Li,Mn3+,Al)3(AlSi3O10)(F,OH)2
Montdorite(K,Na)2(Fe2+,Mn2+,Mg)5(Si4O10)2(OH,F)4
MuscoviteKAl2(AlSi3O10)(OH)2
NanpingiteCsAl2(AlSi3O10)(OH,F)2
Natro-glauconite(Na,K)(Fe3+,Al,Mg)2((Si,Al)4O10)(OH)2
NorrishiteKLiMn23+(Si4O10)O2
Oxykinoshitalite(Ba,K)(Mg,Ti,Fe3+,Fe2+)3((Si,Al)4O10)(O,OH,F)2
OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
ParagoniteNaAl2(AlSi3O10)(OH)2
PhengiteKAl2(AlSi3O10)(OH)2
PhlogopiteKMg3(AlSi3O10)(OH)2
PolylithioniteKLi2Al(Si4O10)(F,OH)2
RoscoeliteK(V3+,Al)2(AlSi3O10)(OH)2
ShirokshiniteKNaMg2(Si4O10)F2
ShirozuliteK(Mn2+,Mg)3(AlSi3O10)(OH)2
SiderophylliteKFe22+Al(Al2Si2O10)(OH)2
SokolovaiteCsLi2Al(Si4O10)F2
Suhailite(NH4)Fe32+(AlSi3O10)(OH)2
TainioliteKLiMg2(Si4O10)F2
TetraferrianniteKFe32+((Fe3+,Al)Si3O10)(OH)2
TetraferriphlogopiteKMg3(Fe3+Si3O10)(OH,F)2
Tobelite(NH4,K)Al2(AlSi3O10)(OH)2
TrilithioniteK(Li1.5Al1.5)(AlSi3O10)(F,OH)2
UM1988-22-SiO:AlCaFFeHKLiMgKLiMgAl2Si3O10F2
VoloshiniteRb(LiAl1.51.5)(Al0.5Si3.5)O10F2
Wonesite(Na,K)(Mg,Fe,Al)6((Al,Si)4O10)2(OH,F)4
YangzhumingiteKMg2.5(Si4O10)F2
ZinnwalditeKLiFe2+Al(AlSi3O10)(F,OH)2
9.EC.05MinnesotaiteFe32+Si4O10(OH)2
9.EC.05TalcMg3Si4O10(OH)2
9.EC.05WillemseiteNi3Si4O10(OH)2
9.EC.10FerripyrophylliteFe3+Si2O5(OH)
9.EC.10PyrophylliteAl2Si4O10(OH)2
9.EC.15BoromuscoviteKAl2(Si3B)O10(OH)2
9.EC.15CeladoniteKMgFe3+Si4O10(OH)2
9.EC.15ChernykhiteBaV23+(Si2Al2)O10(OH)2
9.EC.15MontdoriteKFe2+1.5Mn2+0.5Mg0.5Si4O10(F,OH)2
9.EC.15MuscoviteKAl2(Si3Al)O10(OH)2
9.EC.15NanpingiteCsAl2(Si3Al)O10(OH)2
9.EC.15ParagoniteNaAl2(Si3Al)O10(OH)2
9.EC.15RoscoeliteKV23+(Si3Al)O10(OH)2
9.EC.15Tobelite(NH4)Al2(Si3Al)O10(OH)2
9.EC.15AluminoceladoniteKMgAlSi4O10(OH)2
9.EC.15ChromphylliteKCr2(Si3Al)O10(OH)2
9.EC.15FerroaluminoceladoniteKFe2+AlSi4O10(OH)2
9.EC.15FerroceladoniteKFe2+Fe3+Si4O10(OH)2
9.EC.15ChromceladoniteKMgCrSi4O10(OH)2
9.EC.15TainioliteKLiMg2Si4O10F2
9.EC.15GanteriteBa0.5(Na,K)0.5Al2(Si2.5Al1.5)O10(OH)2
9.EC.20AnniteKFe32+AlSi3O10(OH)2
9.EC.20EphesiteNaLiAl2(Si2Al2)O10(OH)2
9.EC.20HendricksiteKZn3(Si3Al)O10(OH)2
9.EC.20MasutomiliteKLiAlMn2+(Si3Al)O10(F,OH)2
9.EC.20NorrishiteKLiMn23+Si4O12
9.EC.20PhlogopiteKMg3(Si3Al)O10(OH)2
9.EC.20PolylithioniteKLi2AlSi4O10F2
9.EC.20SiderophylliteKFe22+Al(Si2Al2)O10(OH)2
9.EC.20TetraferriphlogopiteKMg3(Si3Fe3+)O10(OH)2
9.EC.20FluorotetraferriphlogopiteKMg3Fe3+Si3O10F2
9.EC.20Wonesite(Na,K,◻)(Mg,Fe,Al)6(Si,Al)8O20(OH,F)4
9.EC.20EastoniteKAlMg2(Si2Al2)O10(OH)2
9.EC.20TetraferrianniteKFe32+(Si3Fe3+)O10(OH)2
9.EC.20TrilithioniteKLi1.5Al1.5(Si3Al)O10F2
9.EC.20FluoranniteKFe32+(Si3Al)O10F2
9.EC.20ShirokshiniteK(Mg2Na)Si4O10F2
9.EC.20ShirozuliteKMn32+(Si3Al)O10(OH)2
9.EC.20SokolovaiteCsLi2AlSi4O10F2
9.EC.20AspidoliteNaMg3(Si3Al)O10(OH)2
9.EC.20FluorophlogopiteKMg3(Si3Al)O10F2
9.EC.20UM2004-49-SiO:AlCsFHKLi(Cs,K)(Al,Li)2.6((Si,Al)4O10)(F,OH)2
9.EC.20Suhailite(NH4)Fe32+(Si3Al)O10(OH)2
9.EC.20YangzhumingiteKMg2.5Si4O10F2
9.EC.20OrloviteKLi2TiSi4O10(OF)
9.EC.20OxyphlogopiteK(Mg,Ti,Fe)3[(Si,Al)4O10](O,F)2
9.EC.25Brammallite(Na,H3O)(Al,Mg,Fe)2((Si,Al)4O10)(OH)2
9.EC.30MargariteCaAl2(Si2Al2)O10(OH)2
9.EC.35AnanditeBaFe32+(Si3Fe3+)O10S(OH)
9.EC.35BityiteCaLiAl2(Si2BeAl)O10(OH)2
9.EC.35ClintoniteCaAlMg2(SiAl3)O10(OH)2
9.EC.35KinoshitaliteBaMg3(Si2Al2)O10(OH)2
9.EC.35FerrokinoshitaliteBaFe32+(Si2Al2)O10(OH)2
9.EC.35OxykinoshitaliteBaMg2Ti4+O2(Si2Al2)O10
9.EC.35FluorokinoshitaliteBaMg3Al2Si2O10F2
9.EC.40Beidellite(Na,Ca)0.3Al2(Si,Al)4O10(OH)2 · nH2O
9.EC.40KurumsakiteZn8Al8V25+Si5O35 · 27H2O
9.EC.40Montmorillonite(Na,Ca)0.3(Al,Mg)2Si4O10(OH)2 · nH2O
9.EC.40NontroniteNa0.3Fe23+(Si,Al)4O10(OH)2 · nH2O
9.EC.40VolkonskoiteCa0.3(Cr,Mg)2(Si,Al)4O10(OH)2 · 4H2O
9.EC.40Yakhontovite(Ca,Na,K)0.2(Cu,Fe,Mg)2Si4O10(OH)2 · 3H2O
9.EC.45HectoriteNa0.3(Mg,Li)3Si4O10(F,OH)2 · nH2O
9.EC.45Saponite(Ca,Na)0.3(Mg,Fe2+)3(Si,Al)4O10(OH)2 · 4H2O
9.EC.45SauconiteNa0.3Zn3(Si,Al)4O10(OH)2 · 4H2O
9.EC.45SpadaiteMgSiO2(OH)2 · H2O(?)
9.EC.45Stevensite(Ca,Na)xMg3-ySi4O10(OH)2
9.EC.45SwineforditeCa0.2(Li,Al,Mg,Fe)3(Si,Al)4O10(OH,F)2 · nH2O
9.EC.45ZincsiliteZn3Si4O10(OH)2 · 4H2O
9.EC.45FerrosaponiteCa0.3(Fe2+,Mg,Fe3+)3(Si,Al)4O10(OH)2 · 4H2O
9.EC.50VermiculiteMg0.7(Mg,Fe3+,Al)6(Si,Al)8O20(OH)4 · 8H2O
9.EC.55Baileychlore(Zn,Fe2+,Al,Mg)6(Si,Al)4O10(OH)8
9.EC.55Chamosite(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8
9.EC.55ClinochloreMg5Al(AlSi3O10)(OH)8
9.EC.55Cookeite(Al,Li)3Al2(Si,Al)4O10(OH)8
9.EC.55FranklinfurnaceiteCa2Mn32+Mn3+Fe3+Zn2Si2O10(OH)8
9.EC.55GonyeriteMn52+Fe3+(Si3Fe3+O10)(OH)8
9.EC.55Nimite(Ni,Mg,Al)6(Si,Al)4O10(OH)8
9.EC.55Orthochamosite(Fe2+,Mg,Fe3+)5Al(AlSi3O10)(OH,O)8
9.EC.55Pennantite(Mn2+,Al)6(Si,Al)4O10(OH)8
9.EC.55SudoiteMg2Al3(Si3Al)O10(OH)8
9.EC.55DonbassiteAl2(Si3Al)O10(OH)2 · Al2.33(OH)6
9.EC.55GlagoleviteNa(Mg,Al)6(Si3Al)O10(OH,O)8
9.EC.55BorocookeiteLiAl4(Si3B)O10(OH)8
9.EC.60AliettiteCa0.2Mg6(Si,Al)8O20(OH)4 · 4H2O
9.EC.60Corrensite(Ca,Na,K)1-x(Mg,Fe,Al)9(Si,Al)8O20(OH)10 · nH2O
9.EC.60DozyiteMg7Al2(Si4Al2)O15(OH)12
9.EC.60HydrobiotiteK(Mg,Fe2+)6(Si,Al)8O20(OH)4 · nH2O
9.EC.60Karpinskite(Mg,Ni)2Si2O5(OH)2(?)
9.EC.60KulkeiteNa0.3Mg8Al(Si,Al)8O20(OH)10
9.EC.60LunijianlaiteLi0.7Al6.2(Si7Al)20(OH,O)10
9.EC.60Rectorite(Na,Ca)Al4(Si,Al)8O20(OH)4 · 2H2O
9.EC.60Saliotite(Li,Na)Al3(Si3Al)O10(OH)5
9.EC.60TosuditeNa0.5(Al,Mg)6(Si,Al)8O18(OH)12 · 5H2O
9.EC.60Brinrobertsite(Na,K,Ca)0.3(Al,Fe,Mg)4(Si,Al)8O20(OH)4 · 3.5H2O
9.EC.65MacaulayiteFe243+Si4O43(OH)2
9.EC.70BurckhardtitePb2(Fe3+Te6+)[AlSi3O8]O6
9.EC.75FerrisuritePb2.4Fe23+Si4O10(CO3)1.7(OH)3 · nH2O
9.EC.75Surite(Pb,Ca)3Al2(Si,Al)4O10(CO3)2(OH)3 · 0.3H2O
9.EC.75NiksergieviteBa2Al3(Si,Al)4O10(CO3)(OH)6 · nH2O
9.EC.80KegelitePb4Al2Si4O10(SO4)(CO3)2(OH)4
16.8.3NybøiteNaNa2(Mg3Al2)(Si7Al)O22(OH)2
16.8.4Ferrierite
16.8.5YagiiteNaMg2(AlMg2Si12)O30
16.8.6PhlogopiteKMg3(Si3Al)O10(OH)2

Other Names for Preiswerkite

Name in Other Languages:

Other Information

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

References for Preiswerkite

Reference List:
American Mineralogist (1980): 65: 1134-1137.

Oberti, R., L. Ungaretti, A. Tlili, D.C. Smith, & J.-L. Robert (1993), The crystal structure of preiswerkite: American Mineralogist: 78: 1290-1298.

Canadian Mineralogist (1998): 36: 905-912.

Internet Links for Preiswerkite

mindat.org URL:
https://www.mindat.org/min-3279.html
Please feel free to link to this page.

Localities for Preiswerkite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
China
 
  • Anhui Province
    • Anqing Prefecture
      • Yuexi Co.
www.scienceinchina.com/ky/0008/ky0748.pdf.
France
 
  • Pays de la Loire
    • Loire-Atlantique
      • Saint-Philbert-de-Grand-Lieu
Mposkos, E., & Perraki, M. (2012). Preiswerkite, Ca-(Mg, Fe)-paragonite and Ca-“ephesite” in metadiorite from the HP Kechros Metamorphic Complex in Eastern Rhodope, NE Greece. Geochemistry, Mineralogy and Petrology Sofia 49, 33-48.
Greece
 
  • Thraki Department (Thrace; Thracia)
    • Komotini Prefecture (Rodopi; Rhodope)
Mposkos, E., & Perraki, M. (2012). Preiswerkite, Ca-(Mg, Fe)-paragonite and Ca-“ephesite” in metadiorite from the HP Kechros Metamorphic Complex in Eastern Rhodope, NE Greece. Geochemistry, Mineralogy and Petrology Sofia 49, 33-48.
Guatemala
 
  • Motagua Valley
Mikhail Ostrooumov and Alfredo Victoria Morales (2010) Mexican jadeite-bearing rock: a first mineralogical and gemmological approach. The Journal of Gemmology, Vol. 32, No. 1–4.
Japan
 
  • Honshu Island
    • Chubu Region
      • Niigata Prefecture
ID by Dr. Miyajima, Fossa Magna Museum.
Norway
 
  • Aust-Agder
    • Froland
Visser, D. et al. (1999) "The occurrence of preiswerkite in a tourmaline-biotite-scapolite rock from Blengsvatn, Norway", American Mineralogist, Volume 84, pages 977–982.
  • Sogn og Fjordane
    • Selje
      • Liset
Smith, D.C. & Kechid, S-A. (1983): Three rare Al-& Na-rich micas in the Liset eclogite pod, Norway: Fe-Mg-margarite, preiswerkite & Na-eastonite. Terra Cognita, 3, 191.
Switzerland (TL)
 
  • Wallis (Valais)
    • Binn Valley
      • Geisspfad area
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 298.
    • Zermatt - Saas Fee area
      • Saas Valley
        • Saas-Almagell
Stalder, H. A., Wagner, A., Graeser, S. and Stuker, P. (1998): "Mineralienlexikon der Schweiz", Wepf (Basel), p. 310.
USA
 
Leonard S.Wiener and Sigrid Ballew,1995, Updated by Kenny Gay,2006, A Listing Of North Carolina Minerals,Geologic Note No.4
    • Clay Co.
      • Buck Creek
Genth,F.A,1891,The Minerals of North Carolina,pg.68 and 94
Dana,E.S,1892,A System of Mineralogy,6th edition,pg.668
    • Macon Co.
      • Cowee Valley
        • Ellijay District
          • Franklin
            • Corundum Hill
Genth F.A,1891,The Minerals of North Carolina,pg.66 and 103
Mineral and/or Locality  
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