Scientific Name: Chiastolite

Group: Silicates – nesosilicates

Chemical composition: Al2OSiO5

Colors: Pink, brown, white, gray, violet, yellow, green, or blue

Hardness: 6.5 to 7.5

Formation: Orthorhombic Crystal; Prismatic form.

Principal Sources: Spain; Brazil; Sri Lanka.

Special Notes: Andalusite is a common regional metamorphic mineral which forms under low pressure and moderate to high temperatures. It is named for the location in Spain where it was discovered. It is a pseudomorph of kyanite and sillimanite.