Euchroite - Encyclopedia
Class : Phosphates, arsenates, vanadates
Subclass : Hydrated arsenates
Crystal system : Orthorhombic
Chemistry : Cu2(AsO4)(OH) 3H2O
Rarity : Very rare
Euchroite is a very rare copper arsenate, sometimes existing in the oxidation zone of arsenic copper deposits. It is also present in neofrmation in slags. Its name comes from the Greek eukhroia (beautiful color). Its crystals are short to isometric prismatic, sometimes thick tabular, of a beautiful emerald green color.
Main photo : Euchroite from Ľubietová, Banská Bystrica, Slovakia © Jordi Fabre
Euchroite in the World
Twinning
No twin known for this mineral species.
Fakes and treatments
No fake listed for this mineral species.
Hardness : 3.5 to 4
Density : 3.44
Fracture : Irregular to sub-conchoidal
Streak : Green
TP : Translucent to transparent
RI : 1.695 to 1.733
Birefringence : 0.038
Optical character : Biaxial +
Pleochroism : Low
Fluorescence : None
Solubility : Acids
Magnetism : None
Radioactivity : None