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Sissone Valley, Malenco Valley, Sondrio Province, Lombardy, Italy
© Chinellato Matteo
|Name:||Named in 1955 by Eric James William Whittaker and Jack Zussman for the type location "The Lizard" at Eastern Cliff, Kennack, Ruan - Grade, Lizard Peninsula, Cornwall, England, UK|
Lizardite is volumetrically the most common serpentine species.
See also the closely related antigorite and chrysotile.
Visit gemdat.org for gemological information about Lizardite. Currently in public beta-test.
Classification of Lizardite
|Strunz 8th edition ID:||8/H.27-20|
|Nickel-Strunz 10th (pending) edition ID:||9.ED.15|
9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
|Dana 8th edition ID:||71.1.2b.2|
71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
|Hey's CIM Ref.:||14.4.8|
14 : Silicates not Containing Aluminum
4 : Silicates of Mg
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Type Occurrence of Lizardite
|Type Locality:||Eastern Cliff, Kennack, Ruan - Grade, Lizard Peninsula, Cornwall, England, UK|
|X-Ray Powder Diffraction:|
Optical Data of Lizardite
|RI values:||nα = 1.541 - 1.563 nβ = 1.565 nγ = 1.553 - 1.568|
|2V:||Measured: 37° to 61°|
|Maximum Birefringence:||δ = 0.012|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Dispersion:||weak to distinct|
Chemical Properties of Lizardite
|Simplified for copy/paste:||Mg3(Si2O5)(OH)4|
|Essential elements:||H, Mg, O, Si|
|All elements listed in formula:||H, Mg, O, Si|
Relationship of Lizardite to other Species
|Series:||Forms a series with Népouite (see here)|
|Member of:||Serpentine Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Lizardite
Polytypes for Lizardite
|Health Warning:||No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.|
References for Lizardite
Mellini, M. (1982) The crystal structure of lizardite 1T: hydrogen bonds and polytypism. American Mineralogist: 67: 587-598.
Mellini, M. and Zanazzi, P.F. (1987) The crystal structure of lizardite-1T and lizardite 2H1 from Coli, Italy. American Mineralogist: 72: 943-948.
Mellini, M. and Viti, C. (1994) Crystal structure of lizardite-1T from Elba, Italy. American Mineralogist: 79: 1194-1198.
Gregorkiewitz, M., Lebech, B., Mellini, M., and Viti, C. (1996) Hydrogen positions and thermal expansion in lizardite-1T from Elba: A low-temperature study using Rietveld refinement of neutron diffraction data. American Mineralogist: 81: 1111-1116.
Benco, L. and Smrcok, L. (1998) Hartree-Fock study of pressure-induced strengthening of hydrogen bonding in lizardite-1T. European Journal of Mineralogy: 10: 483-490.
Balan, E., Saitta, A.M., Mauri, F., Lemaire, C., and Guyot, F. (2002) First-principles calculation of the infrared spectrum of lizardite. American Mineralogist: 87: 1286-1290.
Wicks, F.J. and Chatfield, E.J. (2005) Scrolling of thin crystals of lizardite: an expression of internal stress. Canadian Mineralogist: 43: 193-2004.
Internet Links for Lizardite
Localities for Lizardite
The 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.