Introduction to the Mineral and Rock Hall: The Mineral and Rock Hall is a boutique exhibition hall of the China Geological Museum. The collections in the hall mainly display the minerals and rocks contained in the earth. The world's largest "Crystal King" and the giant firefly are displayed in the exhibition hall. Stone calcite crystal cluster specimens, exquisite azurite, cinnabar, realgar, orpiment, scheelite, stibnite and other thousands of precious specimens are available for everyone to appreciate.