File:Muller (plan) (FindID 852817).jpg

English: Incomplete medium-grained megacrystic granite double-sided muller or rubbing stone. The muller is semi-circular in plan, with one rounded complete end and one broken straight edge, and rectangular in section. Both faces of the muller are flat and smooth as they were used for rubbing, but one side may have originally been convex so that it could be held and pushed across a base for grinding. The muller would have been used with a larger saddle quern to grind grain between the stones to make flour. The granite is medium-grained, megacrystic granite with pale feldspar inclusions varying from 1 - 2 cm to rarely 5 cm in length and dark quartz crystals. The soft felspars would work into hollows and the hard quartz would stand proud of the surface, thus allowing a shearing action to cut and grind the grain. The shape of the muller suggests that it was made from a beach cobble from the Land's End Granite outcrop.

Jones & Taylor (2010) illustrate a similar megacrystic granite muller with small quartz and feldspar megacrysts, which has been derived from a river cobble, excavated from Scarcewater, St Stephen, on page 127, fig.64, no.270, which is dated from the Middle Bronze Age, c.1500-1100 BC.

Jones (2002) illustrates a similar greisen muller excavated from Callestick on page 29, fig.12, no.94 which dates from the Later Bronze Age, c.1100-700 BC.

Nowakowski (1991) illustrates a similar muller of fine-grained granite elvan, excavated from Trethellan, Newquay, on page 142, fig.57, no.88, which dates from the Middle Bronze Age, c.1500-1200 BC.