Do you like black? If yes, then you will love the Black Obsidian Obelisks. It is really black with no obvious rainbows or other colours in it. This shape can also be called a black obsidian generator, black obsidian tower or even a wand. Read more about the shape here.
Most people will buy this stone as a powerful shield against negativity especially of mental type but do not overlook its help in understanding life experiences so you stop being negative. The shape adds nice height among a group of crystals.
Dimensions are for the largest of the black obsidian obelisks. The left and right ones have a slight sheen of silver on one side.