Obsidian snowflake is formed when a volcano errupts. So this stone actually has seen a lot of energy in action. It is black with grey spots. This is formed when low crystalizing minerals forms large crystals in the volcanic glass as it cools. Very attractive. One of my favourites. It is good for winter jewellery because of the black and white or formal wear. You get one 80 cm string when you order this item. The picture will show you the textures and patterns in the stone. Each chip is unique like handwriting or snowflakes. Thus the name obsidian snowflake.