Barite (Bariumsulfate) also spelled Baryte and known as Heavy Spar, contains the heavy mineral barium. It is ground up and used in ao. paint, but although it is a heavy mineral it is not considered poisonous due to it being extremely insoluble.
The radiating form of Barite (known as Bologna Stone) is much sought after. I did not expect the radiation to show up on a photo, but take a close look at the light yellow-green glow over the crystals. It is more obvious in the crystals to the top right on the photo.
Keep in mind that Boltwoodite is radioctive.