As per Native American culture, because cacti can survive in harsh conditions, they've become a symbol of warmth and unconditional, enduring love. As per some Eastern cultures, the cactus has come to symbolize strength and protection and, in some case, lust and attractiveness!
Lava stone is said to alleviate anxiety, promote emotional tranquillity and bring calmness and feelings of relaxation. Lava stone is supposed to have very powerful spiritual effects on the human mind. It's said to cleanse negative thoughts and emotions, as well as stimulate creativity.
You can put essential oils on lava stone, this is especially good for people who suffer headaches often as having peppermint essential oils by the ear can aid in relief