Is a Aluminum Silicate with formula Al2 SiO5
A stone with strong pleochroism, ( the feature to see two colour mixed in the same area). Hardness 6.5-7.5 of the Mohs scale). Clean gems over 5 carats reach very high quotations.
This stone comes from Brazil, the larger exporter country of andalusite today.
Size: 7.5x5.2x3.5 mm.
Weight: 0.96 ct.