What is "lithia emerald"

Lithia \Lith"i*a\ (l[i^]th"[i^]*[.a]), n. [NL., from Gr. li`qos stone.] (Chem.) The oxide of lithium; a strong alkaline caustic similar to potash and soda, but weaker. See Lithium.

Lithia emerald. See Hiddenite.

Emerald \Em"er*ald\, a. Of a rich green color, like that of the emerald. ``Emerald meadows.''
--Byron.

Emerald fish (Zo["o]l.), a fish of the Gulf of Mexico ( Gobionellus oceanicus), remarkable for the brilliant green and blue color of the base of the tongue; -- whence the name; -- called also esmeralda.

Emerald green, a very durable pigment, of a vivid light green color, made from the arseniate of copper; green bice; Scheele's green; -- also used adjectively; as, emerald green crystals.

Emerald Isle, a name given to Ireland on account of the brightness of its verdure.

Emerald spodumene, or Lithia emerald. (Min.) See Hiddenite.

Emerald nickel. (Min.) See Zaratite.

n. hiddenite