Thought I posted this ages ago but must have forgotten, crystals don't seem to appear in the items list. :)
Yeah some items are like multi purpose items. Milk for example gives you 1 water and 1 meat (protein). Crystals give you electronics. They are suppose to give you more then one but they only give one right now. They are planned for high end rewards. I had at one time a much larger item list but decided to simplify it down.