Definitions for "Andalusite"
A silicate of aluminium, occurring usually in thick rhombic prisms, nearly square, of a grayish or pale reddish tint. It was first discovered in Andalusia, Spain.
A pleiochroic gem (meaning that it has different colors when viewed from different angles) whose shades of brown, green and reddish brown can be enhanced by specific orientation and cut. Andalusite is a relatively hard stone, well suited to use in jewelry. It was first discovered in Andalucia, Spain, after which it is named. Today Brazil is the chief producer, but Sri Lanka, Russia and the United States also have deposits.
Carried as a good luck charm. Displays different colours from different angles depending on the way the light refracts from it.
Al SiO. A metamorphic mineral formed by the reconstitution of clay minerals at low pressures and temperatures. See also chiastolite.
A mineral consisting of alumina and silica.
polymorph whose other two minerals are kyanite and sillimanite. A particularly notable variety of andalusite is chiastolite, which has crosses of carbon in it.