11.5" Polish Flint Slab DX722 turtle It has a hardness of

It has a hardness of 6 to 6

This iridescence is caused by the diffraction of light as it interacts with the layers of aragonite

While additional deposits have been identified in places like Canada and the United States

there is no organic matter within the stone

Tanzanite is a blue to violet-blue variety of the mineral zoisite

11.5" Polish Flint Slab DX722 turtle It has a hardness ofPolish Flint Slab Approx. Dimensions: 11. 5 x 5 x . 4 inches Approx. Weight: 570 grams Locality: Sandomierz, Poland Includes acrylic slab stand This slab has a full polish on one side but has been left unpolished on the back. Polish Flint is known for its incredibly beautiful banding. It forms in concretions, or large nodules, in Jurassic limestone from about 160 million years ago. During the Neolithic Period, about 5000 3500 years ago, flint was used