【正】Polyhalite(K2SO4·Mg SO4·2Ca SO4·2H2O)is one of the insoluble potassium mineral which is widely distributed in sulfate-type potassium-bearin
In the Precambrian System of the Yangtze and Cathaysian plates six ore-bearing formations can be identified: the Cu-Pb-Zn-bearing formations in volcanic rocks o
A specimen collected from the Lower Cretaceous Yixian Formation of western Liaoning, China, represents a new genus and species of troodontid theropod. The new t