Utah Septarian Freeform green aventurine and the gypsum crystals get

and the gypsum crystals get compressed

which are responsible for the range of colors from red

Polychrome Jasper (Desert Jasper) is a colorful variety of chalcedony that forms through volcanic activity and hydrothermal alterations

It is characterized by its pink orthoclase feldspar

These pieces have been carved and polished into a T-Rex dinosaur

Utah Septarian Freeform green aventurine and the gypsum crystals getSeptarian nodules that have been carved and polished into a skull shape. The natural cracked pattern gives a unique dragon skin look. These nodules start out as a ball of mud, when the mud dries out and cracks, minerals (primarily calcite and aragonite) fill in the cracks. Septarian nodule from Utah carved and polished into a freeform shape that stands upright. You will receive the exact piece as pictured. Dimensions: 3. 0 L x 3. 0 W x 3. 75 H inches