Septarian Sphere Tourmaline Physical Attributes: Black opal is

Physical Attributes: Black opal is a common variety of opal and usually found in large masses

Weight:   107g     Size: H 57mm x 51mm

fracture-fillings

Weight: 414g       Diameter: 62mm

Septarian Sphere Tourmaline Physical Attributes: Black opal isWeight: 283g Size: 59mm across (All measurements are approximate) Stand sold separately Septarian, also known as Dragon Stone, is a three color concretion made up of limestone, which is grey, and aragonite, which is brown. The word "Septaria," which is used to describe any concretion with internal fissures or cracks, is where the name derives. During the Cretaceous Period of Earth's history, between 50 and 70 million years ago, this unusual mineral