What they are?
These salt chunks are exactly the same salt used to make our salt lamps, salt tea lights and even our fine-ground Pink Himalayan Crystal Salt for human consumption. There is absolutely nothing added to these salt chunks.
This salt contains 82+ trace elements, including magnesium, zinc, selenium and more. It is a "full-spectrum" sea salt that's slightly pinkish in color. The taste is widely considered to have more depth and richness compared to processed white table salt.
A smart preparedness item
Himalayan salt is prized as a valuable preparedness item because human beings cannot live without salt. Although modern-day food is pre-salted, in a collapse or survival scenario, salt suddenly becomes very difficult to get (and goes way UP in value).
In a survival scenario, you'll need salt for storing foods, pickling vegetables, curing meats, cooking soups, and to help eliminate nutritional deficiencies. Because Himalayan salt contains 82+ trace elements, it provides the body with nutritional raw materials that regular white salt cannot.
If you wish to chip off some salt from a salt chunk, here's a tip: Wrap the salt chunk in a towel, then (carefully) hammer away at the towel. This will produce salt grains and small pieces that can be used in cooking. It is a good idea to wear eye protection when hammering, by the way.
Infinite shelf life
These salt chunks have already been "on the shelf" so to speak for millions of years. As long as you keep them dry, they have a shelf life far beyond a human lifespan. Remember: They have been buried under billions of tons of rock and dirt for millions of years. They will do just fine sitting on your shelf. This makes them a smart way to store a valuable survival item that also doubles as a beautiful conversation piece (it's a large crystal that many people find quite intriguing).