Roughness Level

Definition

Illustration

Quartz

Galena

R1

Hammered

Round but hammered surface.

R2

Smoothest

Round and less rough surfaces.

R3

Semi-Rough

Partially round, partially angled and partially rough surfaces.

R4

Rougher

­ For quartz: partially round and rougher surfaces.

­ For Galena: square edges.

R5

Roughest

Rough and sharp angled surfaces.