What Is The Difference Between Marcasite And Hematite I Recently Purchased A Pin That Was Labeled Hematite & Marcasite. What's The Difference Between The Two?

I recently purchased a pin that was labeled Hematite & Marcasite. What's the difference between the two? - what is the difference between marcasite and hematite

I ask because all the stones in my PIN the same look, black / silver, uniform in size and very bright.