Jaspilite is a banded iron formation, composed of hematite and chert. It formed in the Precambrian, long before life existed on land. The bands are thought to represent different seasons, with the chert representing a drier season when there was little run-off from the land and microscopic organisms called diatoms lived in the water. When the diatoms died, their silica shells fell to the ocean floor, forming chert. During the rainy season, with no plants on land, the rocks and soil weathered to hematite that was washed into the ocean.
Because of the age of jaspilite, it is thought to have special properties to amplify strong will, determination and perseverance.