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Metamorphic Rocks of Ring Mountain, Tiburon. At only 602 feet in elevation, Ring Mountain is hardly a mountain. But it is well known to geologist and biologist alike because of its unusual geology and the unique plants that grow in the serpentine soils on the Tiburon peninsula. Serpentine is a metamorphic rock: a rock changed by heat and pressure. The high concentration of magnesium and calcium in the soils is usually toxic to plants, but some rare plants thrive [see: http://www.marin.cc.ca.us/~jim/ring/rplant.html].
Marble and slate are examples of metamorphic rock. Metamorphic rock is formed under extreme pressure combined with heat over time. Metamorphic rocks are so called because they always begin as another type of rock. When slate forms, some of the clay from the original rock is replaced by the mineral mica.arble is a type of metamorphic rock that originates from limestone. Schist is a type of metamorphic rock that can originate from slate which is another type of metamorphic rock. The word metamorphic literally means changed form. Slate, a metamorphic rock, can form from shale, clay or mudstone.