Turgite is a name that is used for two minerals that grew together underneath certain environmental
conditions. The "rainbow" is a naturally iridescent iron oxide coating upon the "mineral" of goethite and hematite and both are in the iron family.
Turgite can come in a couple of colors which are black or red.
Goethite: Oxide minerals of the hydroxide subgroup.
Hematite: minerals. Iron oxide
Origin: Graves Mountain, Georgia
Weight: 28.4 grams