This 20 lb set includes a variety of petrified wood, some agate, and some opal specimens. Perfect for lapidary enthusiasts or collectors, this assortment offers a unique and beautiful addition to any display. The pieces range in size and color, showcasing the natural beauty of these specimens. Whether you're a seasoned collector or just starting out, this set is a super deal that you don't want to miss.The pieces come from a collection of over 40 years. The are semi clean to fully clean they can be soaked in  a vinegar bath for 24 hours then scrubbed wit a light scrub brush and rinsed clean.A light coating of mineral oil can be applies to keep a satin shine or they can be polished. You will not find a better deal anywhere there are some pieces in the set that could be sold for what this grouping is being sold for.Enoy!