ABSTRACTThe time, exact location, and circumstances of the finding of an aerolite from Stonington, Colorado, are not known. The stone is an old fall heavily impregnated with oxide, but most of the crust remains. The original weight was about 6 lb. The specimen is a chondrite of typeCkaand contains about 20% metal and troilite. Of the silicates, 42% are soluble and 37% insoluble.