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Gehlenite

A valid IMA mineral species - grandfathered
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Ca2Al[AlSiO7]
Colour:
yellow-brown, colourless, greenish grey
Lustre:
Vitreous, Greasy
Hardness:
5 - 6
Crystal System:
Tetragonal
Member of:
Melilite Group
Name:
Named in 1815 by Johann Nepomuk von Fuchs in honor of Adolf Ferdinand Gehlen [5 September 1775 Bütow, Outer Pomerania, Prussia (Bytów, Poland) - 16 July 1815]. Gehlen was editor and publisher of publisher of Neues Allgemeines Journal der Chemie (1803–06), Journal für Chemie und Physik (1806-10) and the Repetitorium für die Pharmacie. He was initially a chemistry professor at the University of Halle (Martin-Luther-Universität Halle-Wittenberg) and later chemist at the Bavarian Academy of Sciences. He died early due to arsenic poisoning.
Type Locality:
ⓘMonzoni-Vallaccia Mountains, Trento Province, Trentino-Alto Adige (Trentino-South Tyrol), Italy
Gehlenite-Åkermanite Series.

Chemically very similar tobicchulite andkamaishilite (both hydrous, however).


Unique Identifiers
IMA Formula:
Ca2Al(SiAl)O7

Classification of Gehlenite

9 : SILICATES (Germanates)
B : Sorosilicates
B : Si2O7 groups, without non-tetrahedral anions; cations in tetrahedral [4] and greater coordination
Dana 8th ed.:
55.4.1.2

55 : SOROSILICATES Si2O7 Groups,Generally with no Additional Anions
4 : Si2O7 Groups, Generally with No Additional Anions with cations in [8] and lower coordination
Hey's CIM Ref.:
16.9.1

16 : Silicates Containing Aluminum and other Metals
9 : Aluminosilicates of Ca

Mineral Symbols
Colour:
Yellow-brown, colourless, greenish grey
Streak:
White, grey-white
Hardness:
5 - 6 onMohs scale
Cleavage:
Distinct/Good

Optical Data of Gehlenite
Surface Relief:
Moderate

Chemistry of Gehlenite
Common Impurities:
Ti,Fe,Mg,Mn,Na,K

Crystallography of Gehlenite

Synonyms of Gehlenite

Other Language Names for Gehlenite

Relationship of Gehlenite to other Species
Other Members of Melilite Group:
ÅkermaniteCa2Mg[Si2O7]Tet.42m :P421m
Alumoåkermanite(CaNa)Al[Si2O7]Tet.42m :P421m
BennesheriteBa2Fe2+[Si2O7]Tet.42m :P421m
Ferri-gehleniteCa2Fe3+[AlSiO7]
FerroåkermaniteCa2Fe[Si2O7]Tet.42m :P421m
GugiaiteCa2Be[Si2O7]Tet.42m :P42m
HardystoniteCa2Zn[Si2O7]Tet.42m :P421m
Hydroxylgugiaite(Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5]Tet.42m :P421m
OkayamaliteCa2B[BSiO7]Tet.42m :P421m
Forms a series with:
ÅkermaniteÅkermanite-Gehlenite Series

Common AssociatesTet.42m :P421m9.BB.10OkayamaliteCa2B[BSiO7]Tet.42m :P421m9.BB.10Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth. 222 :C22219.BB.10Alumoåkermanite(CaNa)Al[Si2O7]Tet.42m :P421m9.BB.10ÅkermaniteCa2Mg[Si2O7]Tet.42m :P421m9.BB.10Ferri-gehleniteCa2Fe3+[AlSiO7]9.BB.10FerroåkermaniteCa2Fe[Si2O7]Tet.42m :P421m9.BB.10CebolliteCa5Al2(SiO4)3(OH)4Orth.9.BB.10Hydroxylgugiaite(Ca,◻)2(Si,Be)[(Be,Si)2O5.5(OH)1.5]Tet.42m :P421m9.BB.10GugiaiteCa2Be[Si2O7]Tet.42m :P42m9.BB.15BaryliteBe2Ba(Si2O7)Orth.9.BB.15Barylite-1OBe2Ba(Si2O7)Mon.m :Pm9.BB.20BennesheriteBa2Fe2+[Si2O7]Tet.42m :P421m9.BB.20AndrémeyeriteBaFe2+2(Si2O7)Mon. 2/m :P21/b

Other Information
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    • References for GehleniteⓘLewis Cliff 85311 meteoriteLee et al. (2019)Yurimoto et al. (2001)Jeffrey N. Grossman (1988)
    Argentina
     
    Frank K. Mazdab collection
    Australia
     
    Baker (1953)
    Austria
     
    U. Kolitsch et al. (2009)+1 other referenceThe analysises were made at Joanneum ...Exel (1993)
    Azerbaijan
     
    Agaev et al. (2019)
    Belgium
     
    Giovanni Scapin Collection
    Bulgaria
     
    Yana Tzvetanova et al. (2018)
    Canada
     
    OWENS et al. (2010)Dolan (1923)
    China
     
    Yiming Zhao et al. (1999)Zhao et al. (1999)+1 other referenceYiming Zhao and Daxin Li (2003)Xiyue Wang et al. (1987)Wenji Bai et al. (2001)
    Czech Republic
     
    Pauliš P. Mineralogické lokality ...Žáček et al. (2005)+1 other reference
    Egypt
     
    Methot et al. (1975)
    France
     
    Marrocchi et al. (2014)+1 other referenceJean-Luc Portes CollectionBoisson et al. (2014)
    Georgia
     
    Galuskina et al. (2015)+1 other reference
    Germany
     
    Bender et al. (1994)Hentschel (1987)Weiß et al. (1999)Fischer et al. (1983)Skrzyńska et al. (2023)Juroszek et al. (Ti 5 Fe)Hentschel (1983)Hentschel (1987)+1 other referenceSharygin (2012)Juroszek et al. (2024)Galuskin et al. (2016)Juroszek et al. (2024)in the collection of Christof Schäferin the collection of Christof SchäferHentschel (1961)Schüller et al. (1986)+1 other reference
    Greece
     
    58.+1 other reference
    Hungary
     
    Fehér (2000)
    India
     
    Brearley et al. (1998)
    Indonesia
     
    Knuever et al. (2023)
    Iran
     
    Mollai et al. (2009)
    Israel
     
    Galuskin et al. (2015)Sharygin et al. (2008)Juroszek et al. (2025)Galuskina et al. (2017)+1 other referenceTony Nikischer and Luis Menezes+2 other referencesKrzątała et al. (2023)Sharygin et al. (2019)Galuskina et al. (2024)Sokol et al. (2015)Galuskin EV+4 other referencesGaluskina et al. (2025)Galuskin et al. (2024)Galuskin+1 other referenceFutrzyński et al. (2023)Galuskin et al. (2025)Galuskin et al. (2016)
    Italy
     
    Imma Punzo find & collection[Lapis 1994:5 p.13-23Russo et al. (2004)Panikorovskii et al. (2017)Weisberg et al. (1990)Christophe-Michel-Levy (1968)+4 other referencesSchingaro E. et al. (2001)Stoppani et al. (1982)Carlini et al. (2018)Gresta et al. (2002)Passaglia et al. (1982)Lapis 28 (12)Piccoli et al. (2007)Preite et al. (2007)De Michele (1974)J. N. Fuchs (1815)De Michele (1974)Cathrein (1887 b)+1 other referenceCathrein (1887 b)+2 other referencesExel (1987)De Michele (1974)Liotti L. (Grosseto)Stoppa et al. (2009)Fabio Tosato et al. (2024)+2 other references
    Japan
     
    Matsuyama (2001)Banno Y et al. (2014)Forrest Cureton and Excalibur Mineral ...- (n.d.)Yamada (2004)- (n.d.)- (n.d.)+1 other referenceHarada et al. (2016)Henmi et al. (1973)+6 other references
    Kazakhstan
     
    Ivanova et al. (2012)
    Mexico
     
    Takeshima et al. (2022)Mineralogical Magazine 1964 33 : 841-852Wright F E (1908)Panczner (1987)
    Middle East
     
    Gross (1977)
    Mongolia
     
    Savina et al. (2020)Peretyazhko et al. (2017)Peretyazhko et al. (2018)
    New Zealand
     
    Mason (1957)
    Northwest Africa Meteorites
     
    CaltechFintor et al. (2013)
    Palestine
     
    Sokol et al. (2011)+3 other referencesGaluskina et al. (2014)+1 other referenceJuroszek et al. (2019)
    Poland
     
    Cempa et al. (2024)Kruszewski et al. (Lower Silesian Coal Basin)Ł. Kruszewski EPMA/PXRD data+1 other referenceCempa et al. (2024)Ł. Kruszewski PXRD and EPMA data
    Romania
     
    Marincea+4 other referencesSzakállSzakáll et al. (2006)+1 other referenceMarincea et al. (2011)Constantinescu et al. (1988b)+3 other referencesMarincea et al. (2014, September)+1 other referenceCanadian Mineralogist: 39: 1435-1453.+1 other referenceMarincea et al. (2001)+3 other referencesMartins da Pedra collection
    Russia
     
    Pavel.M. Kartashov (n.d.)+2 other referencesSokol et al. (2019)+1 other referenceGaluskina et al. (2010)Kuzhuget et al. (2020)
    Spain
     
    Doménech-Carbó et al. (2024)
    Sweden
     
    Sandström et al. (2010)
    Turkey
     
    Taner et al. (2013)
    Uganda
     
    Barker et al. (1989)
    UK
     
    Embrey (1978)+2 other referencesTilley et al. (1948)Tilley (1947)Beard et al. (2007)American Mineralogist 35:1080
    USA
     
    Am Min (1962)Murdoch et al. (1966)Woodford et al. (1941)+5 other referencesWoodford et al. (1941)Woodford et al. (1941)Shannon (1922)Schooner (circa 1985)Keil et al. (1969)+1 other referenceBastin (1911)Taylor (1935)+1 other referenceNMBGMR Open-file Report OF-459Anthony et al. (2016)Northrop et al. (1996)Grady et al. (2015)Rocks & Minerals: 66 (3)Fredriksson (1969)+1 other referenceDietrich (1990)Cosca et al. (1988)
    Outer Space
     
    Gornitz (2007)
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