Andalusite
7.5Hardness (Mohs)
Al₂SiO₅Chemistry
2Known origins & mines
Dichroic gem showing green and red simultaneously. Brazil's Jequitinhonha valley dominates supply; Sri Lanka alluvials and Spain (its namesake Andalusia) round out sources.
Known origins & mines
Jequitinhonha Andalusite Fields · Brazil
Brazil supplies nearly all gem andalusite from Jequitinhonha gravels — pleochroic green-red stones cut cleanly despite tricky orientation.…
Ronda Andalusia Type Locality · Spain
The mineral namesake region in southern Spain where andalusite was first described in 1789 - obligatory stop on any origins map despite mode…