Photo of Serpentine Rock
© Michael Baird, shot near Cayucos on Docent George Mason's walk: The Franciscan Mélange at Estero Bluffs (used by permission)
Serpentine
California has a greater number of minerals and a wider variety of rock types than does any other state. Serpentine, a shiny, green and blue rock found throughout California, was named the official State Rock in 1965. It contains the state's principal deposits of chromite, magnesite, and cinnabar. California was the first state to designate a State Rock.
Simmons Trail near San Francisco passes through serpentine rock
photo from Bay Area Hiker (used by permission)
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