The Collaborative International Dictionary
Sphragide
Sphragide \Sphrag"ide\, n.[L. sphragis, -idis, Lemnian earth, fr. Gr. ???, ???, a seal; -- so called because sold in sealed packets.] (Min.) Lemnian earth.
Wiktionary
sphragide
n. (context mineralogy English) Lemnian earth