The term cut base means that the point is in its natural shape and only the point has been polished rather than being shaped mechanically.
Crystal points are often used to direct energies through the apex of a point.
Obsidian is quickly cooled volcanic lava. It is a natural glass. In healing circles, it is known as a stone of protection with grounding properties, it reduces fantasies and helps clear subconscious blocks. Absorbs and disperses negativity. Powerful healer for those attuned to it.