Sunday, 21 May 2017

Andalusite

Andalusite is an aluminum silicate closely related to both sillimanite and kyanite. All three minerals are polymorphs. They share the same chemical composition, but possess different crystal structures. Andalusite is a strikingly beautiful gem, but it is one of the lesser-known gem types in the trade.
Andalusite gemstones are found in very distinct combinations of colors, with a very pronounced level of pleochroism.

New-found appreciation for andalusite is greatly owed to its unmistakable and unique twist on play of color. For many years andalusite has primarily been a collector's stone, but it has recently gained attention from jewelry designers.

It is an ideal hardness, about 7.5 on the Mohs scale.