The iridescence is due to the presence of microscopic crystals of calcium carbonate layered within the shell

some of the crystals are terminated and are mostly clean

This is a superb looking Dhofar 221 classified meteorite weighing 100

Product ID: SPPK9716

Impactite Breccia Suevite | 51.5 Grams | Chassenon, Rochechouart Structure, France | SO24 Fluorescent The iridescence is due toThis is a must have 51. 5 gram Impact Breccia, also referred to as Suevite, from the famous Rochechouart impact structure in South Western France, near the village of Chassenon. Although not a meteorite, impactites are directly linked to them and their impacts and are probably going to be one of the rarest collection items you'll ever own. Impactite is a slag like glassy object found on the surface of the earth, formed from rock melted by the impact