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")