As pictured, you see one pound of horn coral rocks picked from the rocky beach shores of Lake Huron in Michigan. Various sized rocks are in this collection. Will look great in a bowl or vase or wherever you rock on. The rocks you will receive are the ones on the scale. Will be listing additional rocks.
Rugosa corals are so-called because they have a horn-shaped chamber with a wrinkled, or rugose, wall. Rugose corals were found on the sea bottom or on reefs. They have tentacles to assist them in catching prey. from: Rock Hunting Lake Huron (Tips, Facts and Where To Go!) - Rock Seeker
Ships priority mail.