Lizardite

Formula:  Mg₃Si₂O₅(OH)₄

Origin of name:  Locality; The Lizard, Cornwall, England

Crystal system:  Hexagonal

Crystal class:  3m or 6mm

Twinning: 

Unit cell: 

Colour:  Green, green-blue, white

Diaphaneity:  Translucent

Luster:  Waxy

Habit:  Massive, fine- to coarse-grained, compact; small scales

Hardness:  2.5

Specific gravity:  2.55 to 2.60

Cleavage:  1; {0001} perfect

Tenacity: 

Streak: 

Synonyms/varieties:

Comments:  Data are for lizardite-1T; there are also -2H/1 and -6/T polytypes; polymorphous with antigorite, clinochrysotile, orthochrysotile and parachrysotile, series with nepouite