It's actually a form of petrified wood

and due to the plagioclase composition

These specimens measure ~

These massive animals are believed to have reached a height of 3m and a weight range of 350-500kg

25" diameter gem jars for safe display and can be shipped worldwide

Trilobite Fossils, Flexicalymene Medieval It's actually a form ofThese are real fossilized trilobites (Flexicalymene ouzregui)! Trilobites were an extremely adaptive marine arthropod that first evolved roughly 521 million years ago and rapidly spread across the globe. They diversified into approximately 17,000 species and were one of history's most successful animals existing for over 270 million years before extinction! These 2 3" long (average) trilobites date back to the Upper Ordovician and were found in