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Lizardite

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Formula:
Mg3(Si2O5)(OH)4
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.
Lizardite-Népouite Series.

See also the closely related antigorite and chrysotile.
Chrysotile and lizardite are the low-temperature serpentine minerals, whereas antigorite is the high-temperature (>250°C) serpentine mineral.

Visit gemdat.org for gemological information about Lizardite.


Classification of Lizardite

Approved, 'Grandfathered' (first described prior to 1959)
9.ED.15

9 : SILICATES (Germanates)
E : Phyllosilicates
D : Phyllosilicates with kaolinite layers composed of tetrahedral and octahedral nets
71.1.2b.2

71 : PHYLLOSILICATES Sheets of Six-Membered Rings
1 : Sheets of 6-membered rings with 1:1 layers
14.4.8

14 : Silicates not Containing Aluminum
4 : Silicates of Mg

Optical Data of Lizardite

Type:
Biaxial (-)
RI values:
nα = 1.541 - 1.563 nβ = 1.565 nγ = 1.553 - 1.568
2V:
Measured: 37° to 61°
Max Birefringence:
δ = 0.012
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak to distinct

Chemical Properties of Lizardite

Formula:
Mg3(Si2O5)(OH)4
IMA Formula:
Mg3Si2O5(OH)4

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
7.4 (100)
4.6 (80)
3.67 (80)
2.505 (100)
2.156 (80)
1.538 (80)
1.505 (80)

Type Occurrence of Lizardite

Relationship of Lizardite to other Species

Series:
Forms a series with Népouite (see here)
Other Members of this group:
AmesiteMg2Al(AlSiO5)(OH)4
AntigoriteMg3(Si2O5)(OH)4
Baumite(Mg,Al,Mn,Zn,Fe)3(Si,Al)2O5(OH)4
Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
CaryopiliteMn2+3Si2O5(OH)4
ChrysotileMg3(Si2O5)(OH)4
CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
KellyiteMn2+2Al(AlSiO5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4
PecoraiteNi3(Si2O5)(OH)4

Common Associates

Associated Minerals Based on Photo Data:
Titanite21 photos of Lizardite associated with Titanite on mindat.org.
Hydrotalcite17 photos of Lizardite associated with Hydrotalcite on mindat.org.
Hematite14 photos of Lizardite associated with Hematite on mindat.org.
Magnetite11 photos of Lizardite associated with Magnetite on mindat.org.
Chondrodite9 photos of Lizardite associated with Chondrodite on mindat.org.
Chrysotile8 photos of Lizardite associated with Chrysotile on mindat.org.
Calcite8 photos of Lizardite associated with Calcite on mindat.org.
Deweylite7 photos of Lizardite associated with Deweylite on mindat.org.
Dolomite7 photos of Lizardite associated with Dolomite on mindat.org.
Stichtite6 photos of Lizardite associated with Stichtite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.ED.Clinochrysotile
9.ED.05DickiteAl2(Si2O5)(OH)4
9.ED.05KaoliniteAl2(Si2O5)(OH)4
9.ED.05NacriteAl2(Si2O5)(OH)4
9.ED.05Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
9.ED.10HalloysiteAl2(Si2O5)(OH)4
9.ED.10HisingeriteFe3+2(Si2O5)(OH)4 · 2H2O
9.ED.10Halloysite-7ÅAl2(Si2O5)(OH)4
9.ED.15AmesiteMg2Al(AlSiO5)(OH)4
9.ED.15AntigoriteMg3(Si2O5)(OH)4
9.ED.15Berthierine(Fe2+,Fe3+,Al)3(Si,Al)2O5(OH)4
9.ED.15Brindleyite(Ni,Al)3(Si,Al)2O5(OH)4
9.ED.15CaryopiliteMn2+3Si2O5(OH)4
9.ED.15ChrysotileMg3(Si2O5)(OH)4
9.ED.15CronstedtiteFe2+2Fe3+((Si,Fe3+)2O5)(OH)4
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
9.ED.15Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4
9.ED.15KellyiteMn2+2Al(AlSiO5)(OH)4
9.ED.15ManandoniteLi2Al4(Si2AlB)O10(OH)8
9.ED.15Népouite(Ni,Mg)3(Si2O5)(OH)4
9.ED.15PecoraiteNi3(Si2O5)(OH)4
9.ED.15GuidottiiteMn2Fe3+(Fe3+SiO5)(OH)4
9.ED.20Allophane(Al2O3)(SiO2)1.3-2 · 2.5-3H2O
9.ED.20ChrysocollaCu2-xAlx(H2-xSi2O5)(OH)4 · nH2O
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2O
9.ED.25BismutoferriteFe3+2Bi(SiO4)2(OH)
9.ED.25ChapmaniteFe3+2Sb3+(Si2O5)O3(OH)

Related Minerals - Hey's Chemical Index of Minerals Grouping

14.4.1ForsteriteMg2SiO4
14.4.2EnstatiteMgSiO3
14.4.3ClinoenstatiteMgSiO3
14.4.4ChrysotileMg3(Si2O5)(OH)4
14.4.5Clinochrysotile
14.4.6Orthochrysotile
14.4.7Parachrysotile
14.4.9TalcMg3Si4O10(OH)2
14.4.10SpadaiteMgSiO2(OH)2 · H2O (?)
14.4.11SepioliteMg4(Si6O15)(OH)2 · 6H2O
14.4.12LoughliniteNa2Mg3Si6O16 · 8H2O
14.4.13EifeliteKNa3Mg4Si12O30
14.4.14Stevensite(Ca,Na)xMg3-x(Si4O10)(OH)2
14.4.15AntigoriteMg3(Si2O5)(OH)4
14.4.16 Magnesio-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Related Minerals - Dana Grouping (8th Ed.)

71.1.2b.1CaryopiliteMn2+3Si2O5(OH)4
71.1.2b.3Népouite(Ni,Mg)3(Si2O5)(OH)4
71.1.2b.4Greenalite(Fe2+,Fe3+)2-3Si2O5(OH)4

Synonyms of Lizardite

Other Language Names for Lizardite

Simplified Chinese:利蛇纹石

Varieties of Lizardite

Al-lizardite

Aluminian Lizardite

Baumite

Baumite is a medium brown to nearly black manganoan lizardite which, as with many serpentines. may be intergrown with minor amounts of chlorite. Clark [1993, "Hey's Mineral Index"] reports this as a species, but Nickel and Nichols [1991, "Mineral Referenc...

Nickeloan Lizardite

An Ni-bearing Lizardite with insufficient Ni to qualify as Nepouite.

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 Lizardite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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

mindat.org URL:
https://www.mindat.org/min-2425.html
Please feel free to link to this page.
Specimens:
The following Lizardite specimens are currently listed for sale on minfind.com.

Localities for Lizardite

Mineral and/or Locality  
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