Arrojadite - Encyclopedia
Class : Phosphates, arsenates, vanadates
Subclass : Anhydrous phosphates
Crystal System : Monoclinic
Chemistry : KNa4CaFe10Mn4Al(PO4)12(OH)2
Rarity : Uncommon to rare
Arrojadite is a complex primary phosphate of granitic pegmatites. Its name was given to it in honor of the Brazilian geologist Miguel Arrojada Ribiero. It is almost unknown in automorphic crystals but mostly forms cleavable masses of dark to very dark green.
Photos : Arrojadite of Rapid Creek, Yukon, Canada © Gianfranco Ciccolini
Arrojadite in the World
Twinning and special crystallizations
No known twin for this mineral species
Fakes and treatments
No fake or treatments identified for this mineral species.
Hardness : 5
Density : 3,52
Fracture : Irregular
Trace : White
TP : Translucent to transparent
RI : 1.664 to 1.675
Birefringence : 0.011
Optical character : Biaxial +
Pleochroism : Visible
Fluorescence : None
Solubility : Nitric acid, hydrochloric acid
Magnetism : None
Radioactivity : None