|Turgite photo: Crystal Clear Radio|
Originally described from Turjinskii Mine (Turginsk Mine) in Russia, turgite is generally considered a variety of two more common minerals – goethite and hematite.
Turgite often referred to as a "variety" of either hematite or goethite, it is a mixture of the two minerals due to the alteration of goethite, typically found in the botryoidal habit of the "parent" goethite. It may be iridescent.
It apparently only occurs under specific environmental conditions because the pieces I collected in Nevada and brought home to New Mexico lost their luster and turned to dull gray hematite.
See also: The Colorful Outcrops of Turgite in New Mexico
|Turgite coated in a cave|
|Turgite from Graves Mountain, Lincoln Co., Georgia, USA|