field walking finds

I found these artifacts years ago whilst  field walking over an Iron age site partly in our orchard and sadjacent fields, amongst lots of pottery sherds, bones, beads, pig tusk, shale bracelet parts, querns and other finds. This is one of a few spindle whorls along with loom weights I found when this field was annually ploughed up and the rain made things visible. The tapered cube mystery object is about an inch square and very smoothly polished on 3 sides but mainly one, it is of a hard dense heavy purplish stone.
My own thought is that it may have been used for rubbing the stems of nettles or other fibres to make bast for yarn. The other picture shows one of the several circle marks that appear in the field at times. This site has been logged by the local archaeology dept, and on an adjacent hill are graves of Anglo Saxons, but the whole area covers finds from Neolithic through Bronze and Iron ages, Romans to Anglo Saxons and Medieval Tudor to modern. Now under grassland and listed.
Finding this spindle whorl started my interest in spinning and weaving.