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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.

Visit gemdat.org for gemological information about Lizardite.

Classification of Lizardite

Approved
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
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http://www.mindat.org/min-2425.html
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First Recorded Occurrence of Lizardite

X-Ray 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)

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
Essential elements:
All elements listed in formula:

Relationship of Lizardite to other Species

Series:
Forms a series with Népouite (see here)
Other Members of 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
Caryopilite(Mn,Mg)3(Si2O5)(OH)4
ChrysotileMg3(Si2O5)(OH)4
Clinochrysotile
CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
DickiteAl2(Si2O5)(OH)4
Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
GreenaliteFe2-3(Si2O5)(OH)4
HalloysiteAl2(Si2O5)(OH)4
KaoliniteAl2(Si2O5)(OH)4
KellyiteMn22+Al(AlSiO5)(OH)4
ManandoniteLi2Al4(Si2AlB)O10(OH)8
NacriteAl2(Si2O5)(OH)4
Népouite(Ni,Mg)3(Si2O5)(OH)4
Odinite(Fe,Mg,Al,Fe,Ti,Mn)2.4((Si,Al)2O5)(OH)4
Orthochrysotile
Parachrysotile
PecoraiteNi3(Si2O5)(OH)4
Webskyite
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.10HisingeriteFe23+(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.15Caryopilite(Mn,Mg)3(Si2O5)(OH)4
9.ED.15ChrysotileMg3(Si2O5)(OH)4
9.ED.15CronstedtiteFe22+Fe3+((Si,Fe3+)2O5)(OH)4
9.ED.15Fraipontite(Zn,Al)3((Si,Al)2O5)(OH)4
9.ED.15GreenaliteFe2-3(Si2O5)(OH)4
9.ED.15KellyiteMn22+Al(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 (x < 1)
9.ED.20ImogoliteAl2SiO3(OH)4
9.ED.20Neotocite(Mn,Fe,Mg)SiO3 · H2O
9.ED.25BismutoferriteFe23+Bi(SiO4)2(OH)
9.ED.25ChapmaniteFe23+Sb3+(Si2O5)O3(OH)
14.4.1ForsteriteMg2SiO4
14.4.2EnstatiteMgSiO3
14.4.3ClinoenstatiteMgSiO3
14.4.4ChrysotileMg3(Si2O5)(OH)4
14.4.5Clinochrysotile
14.4.6Orthochrysotile
14.4.7Parachrysotile
14.4.9TalcMg3(Si4O10)(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

Other Names for Lizardite

Name in Other Languages:
Simplified Chinese:利蛇纹石

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:
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

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.
Mineral and/or Locality  
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