Brucite

Brucite is the mineral form of magnesium hydroxide named for its discovere, American minerologist Archibald Bruce. Colors vary and may include blue brucite, white brucite, or yellow brucite. Notable finds include in Wood's Chrome Mine in Lancaster County, Pennsylvania as well as in Baluchistan in Pakistan. Besides being collected, it has some uses in Industry including as a source of magnesium and in some applications as a flame retardant.