** Shares of lithium developer Argosy Minerals AGY.AX rise 4.4% to A$0.02
** Co signs spot sales contract with a Hong Kong-based chemical firm for 20 metric tons of battery-quality lithium carbonate from its Rincon project
** Co did not disclose the name of the firm, or provide financial details
** Stock down 15.8% YTD, including current session's moves
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com;))