This is a spectacular example of Ocean Jasper, in the shape of a sail. It has beautiful orbs of orange and green set in a base of white.
Ocean Jasper is a variety of Jasper which contains variably-colored orbs or spherical inclusions or zones. This material is quite attractive when polished and is used as an ornamental stone or gemstone. The name "Ocean Jasper" is used for the variety of Jasper found along the intertidal shores of northeast Madagascar. It is mined out at this point, so good examples are getting harder to find.
This sample is good for those interested in collecting the many forms of Agate, Jasper, or sometimes other minerals, or for those interested in pendant jewelry.
Although this is a cab, you can also glue on "bails", or have the piece drilled to accept a pinch bail. Either approach will let you turn this sample into a fine pendant.