  Magnetization hysteresis loops of tin samples with an inverted opal structure
are presented. The sample formed by tin particles with the size of 70 and 128
nm is found to be a type-I superconductor. The tin sample formed by 80 and 42
nm particles demonstrates an analog of intertype superconductivity: features of
both type-I and II superconductors are observed on the magnetization isothermal
curves. Behaviors of the irreversible and reversible magnetization support
coexistence of type-I and II superconducting nanoparticles in this sample.
