|Oaks, Clouds - Marin County 2016|
|Oak, Rock - Marin County 2016|
Serpentinite is formed from olivine via several reactions, some of which are complementary. Olivine is a solid solution between the magnesium-endmember forsterite and the iron-endmember fayalite. Serpentinite reactions . . . exchange silica between forsterite and fayalite to form serpentine group minerals and magnetite. These are highly exothermic reactions.
Also, the State Rock of California.