Marcasite

The mineral marcasite is sometimes called white iron pyrite or iron sulfite. Marcasite is considered a very brittle stone.
MARCASITE - ROUND MARCASITE-SQUARE
1.00        mm           $.45 1.50       mm           $.75
1.25       mm              .50 2.00       mm             1.00
1.50       mm              .55  
1.75       mm              .60  
2.00       mm              .65  
2.25       mm              .70  
2.50       mm              .75