Lapis lazuli

Mumen (Wyl. mu men) - a precious stone used in Tibetan Medicine and in Vajrayana practices, most likely it is lapis lazuli. Some dictionaries identify it with sapphire, but that seems dubious.

According to the Great Tibetan Dictionary and Tibetan medicine, the taste is astringent, the post-digestive effect is cooling, and it has the ability to bring benefit when afflicted by poisoning, leprosy, diseases related to lymphatic fluid (chu ser) and skin disorders.