Double Eurypterus remipes (Sea Scorpion) ec824443c95d0e87cc3e574f9cdc918c 5 - 7 on the

5 - 7 on the mohs scale

The mineral itself actually belongs to a calcite group of "related carbonates" that are "isomorphous" with each other

a violet stone is colored by vanadium

eurypterids were segmented aquatic arthropods

Current scientific opinion is that all of the material came from the same impact

Double Eurypterus remipes (Sea Scorpion) ec824443c95d0e87cc3e574f9cdc918c 5 - 7 on theEurypterids, commonly known as Sea Scorpions, are an extinct group of arthropods that are related to arachnids and include the largest known arthropods to have ever lived. Prevalent during the Silurain and Devonian ages, eurypterids were segmented aquatic arthropods, with compound eyes, and two club like claws. Some species exhibit toothed claws, and may therefore have been predators. Though they are globally dispersed, eurypterid fossils are uncommon