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