A very nice example of barite from the Linwood Mine. By now you have all seen examples from this occurrence, but a relatively small number had these odd, complex faces and slightly more yellowish color, and were referred to as "solution barite".
This is a particularly good example, the main termination is perfect, and a second one is partially visible where the crystal sits on its matrix. There a couple small edge scuffs.
Apart from producing some of the largest American barite crystals ever found, this is one of the few well known localities in the US state of Iowa, and is also known for its spectacular marcasite included calcite specimens.