This is the first time we've heard of the cold heart jade, which is believed to be able to carry souls. It's also rumored that the cold jade can be used to make a coffin for the dead. The narrator is shocked that there's such a big, heavy, cold-hearted thing in this place. He's not sure if it's the condensation jade that's supposed to be nourishing the soul, or the cold-heart jade that carries souls. He assumes that it must be the legendary soul jade.
This is the first time we've heard of the cold heart jade, which is believed to be able to carry souls. It's also rumored that the cold jade can be used to make a coffin for the dead. The narrator is shocked that there's such a big, heavy, cold-hearted thing in this place. He's not sure if it's the condensation jade that's supposed to be nourishing the soul, or the cold-heart jade that carries souls. He assumes that it must be the legendary soul jade.