Size Classification for Mineral Specimens
Thumbnail specimens: 2 to 30mm (1/16" to 1-1/8")
Miniature specimens: 30 to 64mm (1-1/8" to 2.5")
Small cabinet specimens: 65 to 102mm (2.5" to 4")
Large cabinet specimens: 103 to 152mm (4" to 6")
Extra large cabinet (or "museum") specimens: > 150mm (> 6")