So called fossil Bamboo, these are technically not fossils but casts where greenish-yellow to orange color Agate had formed on the outside of bamboo stems (Genus Equisetum) or other sorts of plant growths. The plants are long gone of course leaving behind hollow voids with a thin skin exterior. The overall look is a lot like a Cadmium Smithsonite and is quite esthetic, botryoidal and very eye-catching. One of the best we have seen from this find in Java, the completeness and color are especially nice. A very odd and uncommon sort of Quartz!