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 % H₂O

Oxygen 51.96 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₃Si₂O₅(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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Lizardite= 1.39 barns/electron
U=PE_Lizardite x rElectron 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 3₁m 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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Print or Cut-and-Paste your Lizardite Specimen Label here :

Lizardite

Mg3Si2O5(OH)4
Dana No: 71.01.02b.02 Strunz No: 09.ED.15
Locality:

Notes:

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