The Collaborative International Dictionary of English v.0.48:

Hammochrysos \Ham`mo*chry"sos\ (h[a^]m`m[-o]*kr[imac]"s[o^]s),
   n. [L., fr. Gr. "ammo`chrysos; "a`mmos, 'a`mmos, sand +
   chryso`s gold.]
   A stone with spangles of gold color in it.
   [1913 Webster]