Himalayan Salt can be used for a number of things, but as it absorbs and neutralises any negative energy it is great for cleansing and charging your crystals.
To use - Place the dry salt in a bowl or jar. Press your crystals into the salt and leave overnight or as long as you think is needed. Brush off all the salt particles to ensure no negative energy remains. You can cleanse more than one crystal with a sachet but make sure you dispose of the himalayan salt once the cleansing process is complete and do not reuse as it will contain any negative energies from the crystals. Do not leave longer than 24 hours as it may harm your crystals. This is not a method to be used on softer crystals such as selenite, malachite, kyanite or any sort of calcite.