The crystals of gypsum - hydrous calcium sulphate - are about half a metre in length.
The crystals of gypsum - hydrous calcium sulphate - are about half a metre in length.
石膏水晶-含有水的硫酸钙-大约半米长。
The crystals of gypsum - hydrous calcium sulphate - are about half a metre in length.
石膏水晶-含有水的硫酸钙-大约半米长。