Tianzhu is a kind of nine-eye stone shale, which is mainly produced in Tibet, eastern Tibet and Ladak. It contains main components of jade and agate inside, also known as "heavenly stone". It is the sacred object of Yongzhongben religion and the first of the seven Tibetan treasures. 天珠是一種九眼石頁岩，主要產自於西藏，藏東和拉答克地區，內部含有玉質和瑪瑙的主要成分，又稱“天降石”。在《藏漢大辭典》里天珠的解釋為:“亞瑪瑙，貓睛石，一種寶石。最早的天珠為像雄天珠，象雄天珠誕生於古代橫跨中亞及青藏高原最強大的文明古國--古象雄王國，它是雍仲本教的聖物，是藏族七寶之首。