Septarian Stone - Egg Size:Large Era: PaleozoicGeological Age: 500mya -

Era: PaleozoicGeological Age: 500mya - 200mya

Approximate Size for 1 piece: 18cm x 9cm x 9cm

The stones are glued to the back page and altogether permanently affixed to the cardboard box/ frame

It reduces stress and alleviates anxiety

Septarian Stone - Egg Size:Large Era: PaleozoicGeological Age: 500mya -Mined from: Madagascar Description: Septarian stones are unique and beautiful limestone nodules with intricately spiderwebbed cracks of calcite running through them. They form when the cracks within sedimentary calcite nodules are filled with calcium carbonate rich water, which slowly crystallizes into black calcite. The calcite is highly UV reactive, glowing a bright yellow color under UV. The color inversion from black to yellow is quite striking!