Red Petrified Wood or what we call Redwood Petrified Stone is named after its Red color and fossilized vegetation texture. This rock wood was formed over millions of years as fossilized remains of trees or other vegetation where the organic materials was replaced with minerals over the years. It is also widely used in hardscaping displays create a submerged red wood forest. Vertical pillars of this stone under water add a unique look that cannot be matched by any other stone. As a result it is gaining traction for use by aquarium hobbyists. Whether you are making a masterpiece aquascaping display or just creating some basic depth in your tank Redwood Petrified Stone is one of the best. You are ordering a mix case of Redwood Petrified Stone of various sizes. Please note that we try our best to pack the rocks that will enhance your display. It can raise water hardness and do not wash this stone as it will wash off the unique red clay on the smooth sections.