Derived from: White core.
Resemblance to Aleppo stone, an agate used to ward off the Aleppo boil that left a red circle with interior pus.
Sold by the Hudson Bay Company.
Earliest Use: at least 1893 (see Ninni and Segatti 1991: 76).
Established trade term by 1879 (Haldeman 1879: 269; therein Coralline d'Aleppo).