Gembone Dinosaur Fossil Bone Slab Unpolished Jurassic Utah UT COA 5721

Description: Welcome to Pioneer Fossils! A Certificate of Authenticity, which has a photo on it of the exact item you purchased, will accompany the specimen. Here is a slab of some wonderful unpolished high-grade Dinosaur Gembone. From a Sauropod. It is about 3.2 inches across at the longest measurement (see photos). Using calipers, the thickness is about 8.3 mm. The specimen weighs 1.85 oz. (52 grams). Nice cell walls and great coloration. From the Morrison Formation, probably from Utah along the Utah-Colorado border. From an old collection. These formed during the Jurassic, about 150 million years ago. This is where gembone is found. It is never Cretaceous, and the Morrison Formation (Jurassic) is home to the best gemstone. Most gemstone is from sauropods, though Allosaurus, Stegosaurus and a few other species can be found. Gembone is one of only 5 recognized gems from living things. The other are pearl, ammolite, jet and amber. It is made from dinosaur bone that has agatized, and minerals from groundwater are deposited within the bones, where the marrow used to be. The trabeculae, which were the spongy partitions in the bone, form a series of borders around the colored minerals. The trabeculae can be dark or light, as can the minerals. The gembone colors are many. Most (about 95%) are “earthy” colors, such as brown, greys and tans. However, reds, blues, whites, yellows, oranges, etc., are in a small number of them (about 5 % of gemstones). These are the most popular colors. The minerals causing these colorations include agate, hematite, iron, pyrite, jasper, marcasite, quartz or other crystal or mineral. Some gemstones have interesting patterns. Some trabeculae “cell walls” resemble spider webs, and are called spider-web gembone, and sell for a premium. Dark trabeculae is usually desired, as it contrasts well with the colors of the minerals. “Glassiness” and clarity are also important. The 1998 rare book, “AMERICAN DINOSAUR The Vanishing of Gembone by Thomas Helfrich”, accurately predicts the increasing rarity and virtual disappearance of gembone, we are told. That is exactly what has happened. Top grade gemstone is almost impossible to find in the wild anymore. That is because of the “perfect storm” of events 35 million years ago in today’s Morrison Formation that allowed gembone to form. Nowhere else in the world, to our knowledge, did this happen in exactly the same way. To quote another, The layers on the Colorado Plateau rose up during the Tertiary intrusions, about 35,000,000 years ago, when the San Rafael Swell and the La Sal, Henry, and Abajo Mountains were formed. As these ranges were forming, local strata layers were flooded with silica-rich, superheated groundwater. This provided the appropriate environment to begin the replacement of the calcite in the original fossils with silicates. We have heard excellent gembone has increased many times in value in just the last few years.Gemstone looks brighter and clearer when it has been polished. Unpolished gemstone is usually displayed wet, to show how it can look when polished. Our photos will have a “wet” or “dry” note in the photo to eliminate possible confusion. We invite you to visit our store. Once inside our store, you will see about a thousand items for sale, and we hope you will love them. We sell items ranging from budget to superb.If you like what we have to offer, please follow our shop by adding us to your favorite Saved Sellers! Just click on the heart. It is the easiest way for you to look us up in the future.You will receive the exact item described and photographed, unless clearly stated otherwise.This item, along with all items we sell, is intended for responsible adults. Please keep out of reach of young children.We will ship this only to the United States. We are not responsible if the buyer reships it somewhere else, after receiving it from us. Our responsibility ends at the destination we ship it to. If you take it out of the United States, you are on your own.COMBINED SHIPPING: We make every effort to combine shipping costs and we refund any overpayment back to you, on the same day we ship the item. We have given hundreds of partial refunds for combined shipping savings. We will do our best to combine purchases to save shipping costs. In some cases, that is easy, in some cases, not as much. Our items are of vastly different sizes and weights, but we never use shipping as a profit center. We would rather refund the shipping overpayment back to you, and have a happy buyer.We are happy to enclose a COA (Certificate of Authenticity). Some words of caution about COA’s: Do not let them become a substitute for learning about the specimens. We have been working with fossils and minerals for many years, and we have seen hundreds of very nice-looking COA’s, some that are wrong, mis-describing a specimen. Have you ever received a Certificate of Authenticity (COA) that had no photo on it of the item you purchased? A COA should be specific to one particular specimen, with a photo of the item on it. At Pioneer Fossils, all of our fossils and minerals come with a COA, with a photo of the exact item you just purchased. It can never be transferred to a different specimen.******************************************************************************************************************************************IMPORTANT: If you are not satisfied with your order, please contact us, and let us make it right, before giving any feedback. We want to make sure you are fairly treated by us always. ***********************************************************************************************************************************On shipments with values of $200 or more, a signature will be required. If your item is less than $200 and you want a signature at delivery, please notify us of that, at the time of purchase.Return Policy: If you are not satisfied with your item, please contact us within 72 hours of receiving the item. We'll refund your purchase price, minus shipping charges, upon safe return of the item to us in original condition (item cannot be altered or damaged) within 30 days of buyer’s receipt of item. Failure to contact us within 72 hours of receipt of item, voids this offer. Buyer is responsible for all return shipping charges. 5721 storage FE19

Price: 44.95 USD

Location: Salt Lake City, Utah

End Time: 2023-12-20T05:40:35.000Z

Shipping Cost: 4.99 USD