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Fraipontite

A valid IMA mineral species - grandfathered
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(Zn,Al)3((Si,Al)2O5)(OH)4
May contain some Cu.
Colour:
Yellowish white to bluish
Lustre:
Silky
Hardness:
3½ - 4
Specific Gravity:
3.08 - 3.10
Crystal System:
Monoclinic
Member of:
Serpentine Subgroup >Kaolinite-Serpentine Group
Name:
Named in 1927 by Giuseppe Raimondo Pio Cesàro in honour of Julien Jean Joseph Fraipont (17 August 1857, Liège, Belgium — 22 March 1910, Liège, Belgium), paleontologist and professor of zoology at the University of Liège and noted for his work on Neanderthal man and in honor of his son, Charles Marie Joseph Julien Fraipont (21 March 1883, Chênée, Liège, Belgium — 15 April 1946, Forest, near Frasnes-lez-Anvaing, Belgium), professor of paleontology at the University of Liège and who also studied Neanderthal man, as well as subjects in his specialty of phytopaleontology.
Co-Type Localities:
ⓘAltenberg mine, Kelmis, Liège, Wallonia, Belgium
ⓘAkdzhal deposit, Akdzhal, Zharma District, Abai Region, Kazakhstan
ⓘSterling Mine, Sterling Hill, Ogdensburg, Sussex County, New Jersey, USA
Isostructural with:
Amesite,Berthierine,Cronstedtite,Lizardite
Comparesauconite andzincsilite.

See alsoUnnamed (Cu analogue of Fraipontite).


Unique Identifiers
IMA Formula:
(Zn,Al)3(Si,Al)2O5(OH)4
First published:
1927
Type description reference:
Cesàro, G. (1927) Sur la fraipontite, silicate basique hydraté de zinc et d'aluminium. Annales de la Société Géologique de Belgique, 50, 106-110.

Classification of Fraipontite

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
Dana 8th ed.:
71.1.2c.4

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
Hey's CIM Ref.:
16.12.16

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn

Mineral Symbols
Transparency:
Translucent, Opaque
Colour:
Yellowish white to bluish
Streak:
White, pale green
Hardness:
3½ - 4 onMohs scale
Density:
3.08 - 3.10 g/cm3 (Measured)    3.49(5) g/cm3 (Calculated)

Optical Data of Fraipontite
Surface Relief:
Moderate
Dispersion:
r < v strong

Chemistry of Fraipontite
Common Impurities:
Fe,Cu,Mg,Ca,K

Crystallography of Fraipontite
General Appearance of Type Material:
Crusts of fibers 4-10 mm thick on smithsonite
Place of Conservation of Type Material:
University of Liège, Liège, Belgium, 13727.
Associated Minerals at Type Locality:
Smithsonite
Reference:
Cesàro, G. (1927) Sur la fraipontite, silicate basique hydraté de zinc et d'aluminium. Annales de la Société Géologique de Belgique, 50, 106-110.

Synonyms of Fraipontite

Other Language Names for Fraipontite

Varieties of Fraipontite

Relationship of Fraipontite to other Species
Other Members of Serpentine Subgroup:
AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 :P1
AntigoriteMg3(Si2O5)(OH)4Mon.m :Bm
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon.m :Bm
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.
CaryopiliteMn2+3Si2O5(OH)4Mon.
ChrysotileMg3(Si2O5)(OH)4Mon.m :Bb
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m :P31m
GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 :P63
KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 :P63
LizarditeMg3(Si2O5)(OH)4Trig. 3m :P31m
NépouiteNi3Si2O5(OH)4Orth.
PecoraiteNi3(Si2O5)(OH)4Mon.

Common AssociatesMon. 2/m9.ED.05DickiteAl2(Si2O5)(OH)4Mon.m :Bb9.ED.05NacriteAl2(Si2O5)(OH)4Mon.m :Bb9.ED.05KaoliniteAl2(Si2O5)(OH)4Tric. 1 :P19.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4Mon.m :Bm9.ED.10HalloysiteAl2(Si2O5)(OH)4Mon.m :Bb9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2OMon.9.ED.10HydrohalloysiteAl2Si2O5(OH)4 · 2H2OMon.m9.ED.15AntigoriteMg3(Si2O5)(OH)4Mon.m :Bm9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4Mon.9.ED.15NépouiteNi3Si2O5(OH)4Orth.9.ED.15PecoraiteNi3(Si2O5)(OH)4Mon.9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4Hex. 6 :P639.ED.15LizarditeMg3(Si2O5)(OH)4Trig. 3m :P31m9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4Mon.m :Bm9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4Hex. 6 :P639.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4Trig. 3m :P31m9.ED.15CaryopiliteMn2+3Si2O5(OH)4Mon.9.ED.15 vaChromoamesiteMg2(Al,Cr)(AlSiO5)(OH)49.ED.15AmesiteMg2Al(AlSiO5)(OH)4Tric. 1 :P19.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4Mon.9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8Orth. 222 :C22219.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1Orth.9.ED.20Neotocite(Mn,Fe)SiO3 · H2O (?)Amor.9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2OAmor.9.ED.20ImogoliteAl2SiO3(OH)49.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)Mon.m :Bm9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)Mon.m :Bm9.ED.30PianliniteAl2Si2O6(OH)2Orth.

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    • References for FraipontiteⓘIron Monarch Main PitFrancis (2010)Bottrill et al. (2008)
    Austria
     
    G. Niedermayr: Carinthia II (1987)
    Belgium (TL)
     
    Cesàro (1883)+3 other referencesJoan RosellMélon et al. (1976)+1 other reference
    Chile
     
    maurzi
    Cuba
     
    Torró et al. (2016)
    France
     
    Queneau (n.d.)André Melle collection; EDX analysis V. Bourgoin (AJW, Paris)
    Germany
     
    Wrede (2019)Wittern (2001)Schnorrer (1995)+1 other reference
    Greece
     
    Lapis et al. (1999)Rieck (n.d.)
    Italy
     
    Orlandi et al. (2007)+1 other reference//doi.org/10.57635/MICRO.2025.23.16A.Costantini (2015)Orlandi et al. (2009)Merlino et al. (2001)+2 other references
    Kazakhstan (TL)
     
    Chukrov (1956)+1 other referenceChukrov (1956)
    Mexico
     
    Gazquez et al. (1)
    Morocco
     
    F. Choulet et al. (2016)
    Namibia
     
    Gebhard (1999)
    Peru
     
    Arfè et al. (2017)+1 other reference
    Portugal
     
    Pedro Alves analytical data
    Romania
     
    minerals-of-the-carpathians.eu (2008)Hîrtopanu (1997)+1 other reference
    Spain
     
    Calvo Rebollar et al. (2022)Favreau (n.d.)Calvo (2018)Calvo (2018)Calvo et al. (Spain)
    Switzerland
     
    Ansermet (2012)
    Turkmenistan
     
    Vladimir A. Maltsev (1993)+2 other references
    UK
     
    Pluth et al. (2005)Daltry et al. (1994)Day (1999)Plant et al. (1996)
    USA
     
    Foord et al. (1983)+1 other referenceFoord et al. (1983)+1 other reference1+1 other referenceRobert M. Housley (2005)Wise (1993)Thorne (n.d.)Collected by and in the collection of ...Hayes et al. (2008)Castor et al. (2004)Martin Jensen and Joe Leising (unpublished analysis, 1999)Castor et al. (2004)Castor et al. (2004)Chukrov (1956)+1 other referenceLuetcke (n.d.)R. D. Green photoNMBMMR New Mexico Mineral symposium (2003)Northrop et al. (1996)Northrop et al. (1996)Jerry Cone CollectionTiny MineralsNorthrop et al. (1996)
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