Lizardite Mineral Data
General Lizardite Information
Chemical Formula:
Mg3Si2O5(OH)4
Composition:
Molecular Weight = 277.11 gm
Magnesium 26.31 % Mg 43.63 % MgO
Silicon 20.27 % Si 43.36 % SiO2
Hydrogen 1.45 % H 13.00 % H2 O
Oxygen 51.96 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mg3 Si2 O5 (OH)4
Environment:
Serpentinization alteration of Mg silicates below 75 deg. C.
IMA Status:
Valid Species (Pre-IMA) 1956
Locality:
Kennack Cove, The Lizard, Cornwall, England. Link to MinDat.org Location Data.
Name Origin:
Named for the locality.
Name Pronunciation:
Lizardite + Pronunciation
Synonym:
Maufite - Interstratified clinochlore-lizardite
Orthoantigorite
Lizardite Image
Images:
Lizardite
Comments: Lizardite pseudomorphously replacing olivine.
Location: Snarum, Norway.
Scale: 2x2 cm.
© Dave Barthelmy
Lizardite Crystallography
Axial Ratios:
a:b:c =0.5769:1:4.6426
Cell Dimensions:
a = 5.308, b = 9.2, c = 42.712, Z = 12; alpha = 90°, beta = 90°, gamma = 90° V = 2,085.78 Den(Calc)= 2.65
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 7.12(1), 2.379(0.9), 3.56(0.8),
Physical Properties of Lizardite
Cleavage:
{001} Perfect
Color:
Green, Green blue, Yellow, White.
Density:
2.55 - 2.6, Average = 2.57
Diaphaneity:
Translucent
Hardness:
2.5 - Finger Nail
Streak:
white
Optical Properties of Lizardite
Gladstone-Dale:
CI meas = 0.021 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = 0.048 (Good) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.211,KPDmeas = 0.2171,KC = 0.2217 Ncalc = 1.57 - 1.59
Optical Data:
Biaxial (-), a=1.541-1.5625, b=1.565, g=1.553-1.568, bire=0.0055-0.0120, 2V(Meas)=37-61.
Calculated Properties of Lizardite
Electron Density:
Bulk Density (Electron Density)=2.60 gm/cc note: Specific Gravity of Lizardite =2.58 gm/cc.
Fermion Index:
Fermion Index = 0.03 Boson Index = 0.97
Photoelectric:
PELizardite = 1.39 barns/electronU=PELizardite x r Electron Density= 3.62 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lizardite is Not Radioactive
Lizardite Classification
Dana Class:
71.01.02b.02 (71) Phyllosilicate Sheets of Six-Membered Rings
(71.01) with 1:1 layers
(71.01.02b) Serpentine group (Lizardite subgroup)
71.01.02b.01 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
71.01.02b.02 Lizardite Mg3Si2O5(OH)4 P1 1
71.01.02b.03 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
71.01.02b.04 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
Strunz Class:
09.ED.15 09 - SILICATES (Germanates)
09.E - Phyllosilicates
09.ED -Phyllosilicates with kaolinite layers
09.ED.15 Clinochrysotile ? Mg3Si2O5(OH)4 Cc, C 2/m Mono
09.ED.15 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m
09.ED.15 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2
09.ED.15 Amesite Mg2Al(SiAl)O5(OH)4 C1 1
09.ED.15 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m
09.ED.15 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono
09.ED.15 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m
09.ED.15 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 31 m 3m
09.ED.15 Chrysotile Mg3Si2O5(OH)4 A2/m 2/m
09.ED.15 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2
09.ED.15 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono
09.ED.15 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 63 6
09.ED.15 Maufite ? (Mg,Ni)Al4Si3O13•4(H2O)(?) Mono ? Mono
09.ED.15 Lizardite Mg3Si2O5(OH)4 P1 1
09.ED.15 Orthochrysotile ? Mg3Si2O5(OH)4 Unk Ortho
09.ED.15 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1
09.ED.15 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m
09.ED.15 Parachrysotile ? Mg3Si2O5(OH)4 Unk Ortho
Other Lizardite Information
References:
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
See Also:
Links to other databases for Lizardite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST
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Lizardite
Mg3Si2O5(OH)4
Dana No: 71.01.02b.02 Strunz No: 09.ED.15
Locality:
Notes:
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