An andalusite gem.
a very hard, orthorhombic silicate of aluminum, AlSiO, usually found in schist, slate, or other metamorphic rocks and used to make various high-temperature materials and as a gem
Origin of andalusiteafter Andalusia, where it was discovered
A hard, grayish white to pinkish brown mineral (Al2SiO5), occurring as nearly square prisms, often with cruciform cross sections, in metamorphic rock.
Origin of andalusiteAfter Andalusia.