There are a few different types of salt blocks that are commonly used for horses. The most popular type is the mineral block, which is made up of compressed minerals and trace elements. This type of salt block is designed to provide your horse with a complete and balanced diet of essential nutrients. Another popular type of salt block is the Himalayan salt block, which is mined from the Himalayan mountains. This type of salt block is rich in minerals and trace elements, making it an excellent choice for horses that need a high level of nutrition.