Orange crystals of the rare very rare mineral tooleite from a new find in Spain: Alcantarilla Mine, Belalcazar, Córdoba, Andalusia, Spain. — Photo: David Hospital · CC BY-SA 4.0
Tooeleite
Tooeleite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Fe³⁺₆(AsO₃)₄(SO₄)(OH)₄·4H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 3; specific gravity 4.23; Cadmium-orange streak; Greasy luster; optically biaxial.
IMA symbol Toe, IMA status: approved, named in 1990.
Occurs as an uncommon secondary mineral in the oxidized zone of a replacement orebody in metamorphosed limestone. Formed by bacterial action in acid mine drainage.
It is found associated with Jarosite, scorodite, sulfur, kaatialaite, pyrite, arsenopyrite, galena, sphalerite, goethite, gypsum.
The name refers to its initially noted occurrence in Tooele Co., Utah, USA.