Lizardite

Lizardite is named after its discovery locality, in Kennack Cove, The Lizard, Cornwall, England.

Lizardite is the most common serpentine species. It forms extremely fine-grained scales and massive aggregates, very rarely crystals up to 2 mm of green, light yellow to white, colorless to pale green colour.

Lizardite is used for ornamental carvings.
General Information
Chemical Formula
Mg
 
3
Si
 
2
O
 
5
(OH)
 
4
Anthony et al, Handbook of mineralogy (2001)
Photos of natural/un-cut material from mindat.org
Physical Properties of Lizardite
Mohs Hardness2.5 to 0
Anthony et al, Handbook of mineralogy (2001)
Specific Gravity2.55
Anthony et al, Handbook of mineralogy (2001)
Cleavage QualityPerfect
Anthony et al, Handbook of mineralogy (2001)
Optical Properties of Lizardite
Refractive Index1.538 to 1.560
Anthony et al, Handbook of mineralogy (2001)
Optical CharacterUniaxial/-
Anthony et al, Handbook of mineralogy (2001) To slightly biaxial
Colour
Colour (General)Green, light yellow to white; colorless to pale green in thin section.
Anthony et al, Handbook of mineralogy (2001)
TransparencyTranslucent
Anthony et al, Handbook of mineralogy (2001)
LustreWaxy
Anthony et al, Handbook of mineralogy (2001)
Crystallography of Lizardite
Crystal SystemHexagonal
Anthony et al, Handbook of mineralogy (2001) Pseudo-orthorhombic
HabitCrystals rare, to 2 mm, as trigonal plates to truncated trigonal pyramids. Commonly as extremely fine-grained scales and massive aggregates.
Anthony et al, Handbook of mineralogy (2001)
Geological Environment
Where found:Typically a product of retrograde metamorphism, replacing olivine, orthopyroxene, or other minerals in ultramafic igneous rocks.
Anthony et al, Handbook of mineralogy (2001)
Further Information
Mineral information:Lizardite information at mindat.org
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