Strong’s Hebrew
H5508 — cochereth
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
סֹחֵרֶת
cochereth — pronounced so-kheh'-reth
similar to 5507; probably a (black) tile (or tessara) for laying borders with:--black marble. see H05507
1 occurrence in the KJV.
Esther 1:6
Where were white, green, and blue, hangings, fastened with cords of fine linen and purple to silver rings and pillars of marble: the beds were of gold and silver, upon a pavement of red, and blue, and white, and black, marble.