A Race against Time

After a long silence, Azima took a deep breath, pointed to Roland's desk and said, "There's a stone made of the same material in your drawer."

"Correct." Roland returned Azima a satisfied smile and put the other box on the desk. "But I'm a bit curious. Why did you call it 'a stone made of the same material' instead of 'an identical one'?"

"Because... the reactions were different. Although they're both source materials, the reaction of the first one is stronger." Azima then described what she had seen.

"Can you locate more pieces?"

"Please let me try."