What is Lizardite?
Lizardite is a common serpentine-group mineral with green layered textures, formed as water alters magnesium-rich ultramafic rocks.
Mineralogy and crystal structure
Reference formula: Mg3Si2O5(OH)4. Lizardite is a layered 1:1 phyllosilicate and one of the main serpentine-group minerals, alongside chrysotile and antigorite. Polytypism and intergrowths are common, so texture, association and analytical data are more reliable than colour alone. Lizardite is classified with silicates and has a trigonal crystal system. Typical hardness is 2.5–3.5 on the Mohs scale and specific gravity is approximately 2.5–2.7.
Colour, lustre and habit
Typical colours include green, yellow-green, white, brown. The usual platy, fibrous, massive habit and pearly, waxy, dull lustre help describe a specimen, but colour alone is not diagnostic.
Formation and notable localities
Lizardite forms in or is associated with serpentinisation of peridotite and other magnesium-rich ultramafic rocks. Important documented localities include Italy, the United Kingdom, Canada, the United States, New Zealand and Russia.
Green texture from the deep Earth
Lizardite makes a strong educational and decorative reference because its quiet green colour carries a major geological message: seawater and fluids transformed mantle rock into serpentine. Polished patterns and natural foliation give every piece a distinct surface.
Collecting and care
Soft surfaces scratch easily; avoid acids, abrasive cleaning and inhaling dust from crushed or sawn material.
