Iyo Aozora Stone This stone is produced in Ehime, Shikoku, and has been highly prized among blue stones since ancient times. It is used in stone arrangements and landscape stones, and is characterized by its beautiful wrinkles and white streaks within the blue-green color. I think it would look beautiful in an aquarium! This is an Iyo Aozora stone from my parents' garden. I am selling it because I am cleaning up the garden. I will be listing more items as well. Width: 19cm Height: 14cm Depth: 4cm Blue Stone Garden Stone Turtle Stone