Strong's #5508: cochereth (pronounced so-kheh'-reth)

similar to 5507; probably a (black) tile (or tessara) for laying borders with:--black marble.

Brown-Driver-Briggs Hebrew Lexicon:

sôchereth

1) a stone used in paving (with marble)

Part of Speech: noun feminine

Relation: similar to H5507

Usage:

This word is used 1 times:

 

Esther 1:6: "of red, and blue, and white, and black marble."