Virgin Valley Precious Opal Petrified Wood Log Nevada 89.4cts! Virgin Valley Black Precious Opal Petrified Wood Nevada 41.2cts! 41.2 carats with Black Precious Opal. Opalized, Petrified Wood from Virgin Valley. A true collectors dream. This is shown wet. It’s an awesome specimen. X21x14mm or 1″ x 7/8″ x 9/16. This is a rare specimen of petrified, fossilized, opalized wood from the famous Virgin Valley Nevada Opal area in Humbolt Co. NV is a wonderful display specimen. The geological time is Miocene. Don’t pass up this oportunity to add this important piece to your collection! I have many other great items for sale: I list new items almost constantly both in auctions and in my store. View My Other Items For Sale. Or, why not add me to your favorite sellers list! Get images that make Supersized seem small. Showcase your items with Auctiva’s. Track Page Views With. Auctiva’s FREE Counter.