Gallium APEX Mineral

Gallium (Ga #31) is the next element on the periodic table for my APEX mineral collection. 

Wikipedia Gallium

Gallium Minerals - There are only about 10 Gallium minerals.

Gallite (CuGaS2) with 35% Gallium is the ONLY choice for APEX Mineral.  This only occurs as small inclusions in other minerals.  The gray specks in the above rock are Gallite inclusions.

Gallium will melt in the hand since its melts at slightly above room temperature.  Gallium expands when it solidifies so it cannot be stored in glass/metal containers. 

Gallium was unknown before the 19th century.

Gallium is almost exclusively used for microelectronics. 

Gallium has no known role in biology.