Sleck-stone
. The ebon stone used by goldsmiths to slecken (polish) their gold with. Curriers use a similar stone for smoothing out creases of leather; the slecker is also made of glass, steel, etc. (Icelandic, slīkr, our word sleek.)
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.