hammŏchrȳsos (amm-), i, m., = ἀμμόχρυσος (gold sand),
a precious stone unknown to us , perh. golden mica , Plin. 37, 11, 73, § 188; Isid. 16, 15, 5.
·noun A stone with spangles of gold color in it. ...
Webster's Dictionary of the English Language