Scyphocrinus Crinoid with Dalmanites Trilobite (with stand) ed10ce8492811be02f7a425d8730a8ae with only Diamond and Moissanite

with only Diamond and Moissanite being harder

The array of coloration in the layers of onyx is simply amazing

it forms hexagonal crystals

Eurypterids

calcite and other minerals

Scyphocrinus Crinoid with Dalmanites Trilobite (with stand) ed10ce8492811be02f7a425d8730a8ae with only Diamond and MoissaniteCrinoids began life some 530 million years ago. They are plant like sea creatures, some of which either root themselves underwater or gently float along the sea bed, gathering tiny organisms for nourishment. Crinoids often resemble flowers planted in the sea floor, giving them their name from the Greek word for "Lilly." Crinoids are remarkably adaptable animals and they are a good example of what is referred to as a "living fossil", as many different