In 1872 some construction workers uncovered a sacred rock while digging a hole for a fence post near the shores of Lake Winnipesaukee in New England, U.S.A.
This egg shaped rock had mysterious carvings on it, these carvings were so elaborate and well made that their is no way they could have been made using “stick and stone” technology.
Some believe this rock is a thunderstone, a legendary stone that Native Americans believed fell from the sky and came from the gods.
The most popular theory (taken from Out of Place Artifact: The Mysterious Stone Egg of Lake Winnipesaukee | Ancient Origins) is this;
Is the Mystery Stone a Native American “Birth Stone?”
Indigenous historian Joe Graveline suggested an interesting purpose for the Mystery Stone – he told Greenfield Recorder in 2018 that he believes it was a Native American birth stone. According to the Greenfield Recorder, a birth stone is “a stone that was heated and internally placed inside the pregnant woman by midwives to relax muscles during difficult births.”
Graveline says this particular stone would have been extra special and used by a Native American midwife to help a mother “deliver a person who became a venerated spiritual or governmental leader of either sex.” He also believes that it was a grave offering and if the construction workers had dug a little deeper they would have encountered bones.
If you want to know more this article below is definitely worth a read.