Dead jade. Lantian jade is divided into dead jade and live jade, the underwater part of hot spring is live jade, the water part of hot spring is dead jade, lantian jade sold by Xi 'an is on the upper part of hot spring water, Xi 'an is dead jade, and lantian jade is dead jade. The living jade in lantian jade refers to the natural superior lantian jade, and the dead jade refers to the artificially treated inferior lantian jade.