Limb cast C

This limb cast is 2 inches long and about 1 inch in diameter. Limb Casts are created when agate is deposited in cavities formed by tree branches covered by volcanic ash. The wood burns away after being covered by the hot ash. Under the right conditions agate fills the empty space. The result is a piece of agate that has the form of a tree limb, hence the name limb Cast. Some of these casts show the bark and wood textures. Pink and green limb casts are highly prized by collectors.