What is "glance cobalt"

Glance \Glance\, n. [Akin to D. glans luster, brightness, G. glanz, Sw. glans, D. glands brightness, glimpse. Cf. Gleen, Glint, Glitter, and Glance a mineral.]

1. A sudden flash of light or splendor.

   Swift as the lightning glance.
   --Milton.

2. A quick cast of the eyes; a quick or a casual look; a swift survey; a glimpse.

   Dart not scornful glances from those eyes.
   --Shak.

3. An incidental or passing thought or allusion.

   How fleet is a glance of the mind.
   --Cowper.

4. (Min.) A name given to some sulphides, mostly dark-colored, which have a brilliant metallic luster, as the sulphide of copper, called copper glance.

   Glance coal, anthracite; a mineral composed chiefly of carbon.

   Glance cobalt, cobaltite, or gray cobalt.

   Glance copper, chalcocite.

   Glance wood, a hard wood grown in Cuba, and used for gauging instruments, carpenters' rules, etc.
   --McElrath.