Definition of "slickstone"

Take a Sheet of Lead, and have a piece of Lead made like a Slickſtone; then between them two grind white Lead and Sallet-Oil till 'tis very fine, put it in a Gallipot for uſe.

1729, E[liza] S[mith, “Another for the Same [Piles]”, in The Compleat Housewife: Or, Accomplished Gentlewoman’s Companion: […], 3rd edition, London: […] J. Pemberton, […], page 286

Fig. 133 represents a white marble slickstone or smoothing implement of altogether different pattern from any previously described […]

1881, Charles Conrad Abbott, Primitive Industry: Or, Illustrations of the Handiwork, in Stone, Bone and Clay […] ‎, Salem, Mass.: George A. Bates, page 144

Rounded stone and glass objects with fine radiating scratches on one surface represent the slickstones that were used in garment-making and laundry, to smooth the cloth and to press seams and pleats.

2020 January 31, Penelope Walton Rogers, “Textile networks in Viking-age towns of Britain and Ireland”, in Stephen P. Ashby, Søren Sindbæk, editors, Crafts and Social Networks in Viking Towns‎, page 101