Lizardite

Lizardite is a mineral belonging to the serpentine group, specifically an end-member of the antigorite solid solution series. Its chemical formula is Mg3Si2O5(OH)4, which it shares with other serpentine minerals. It is characterized by its greenish color, often mottled or banded, which can range from pale green to dark green, and sometimes exhibits a waxy or greasy luster. Lizardite typically forms in metamorphic rocks, particularly in areas where ultramafic rocks like peridotite have been altered by hydrothermal processes. It is commonly found as a secondary mineral, replacing olivine and pyroxene. The texture of lizardite can vary, appearing as fine-grained masses, fibrous aggregates, or even pseudomorphs after other minerals. While not typically considered a gem material, some varieties of lizardite with attractive color patterns can be polished and used in decorative objects or jewelry. It is often found in association with other serpentine minerals such as chrysotile and antigorite, and other alteration minerals like brucite. Significant deposits of lizardite are found in various locations worldwide, including Canada, the United States, Italy, and New Zealand. Its presence is often an indicator of serpentinization, a geological process of hydration and alteration of mafic and ultramafic rocks.