The variety chiastolite commonly contains dark inclusions of carbon or clay which form a checker-board pattern when shown in cross-section.
The clear variety first found in Andalusia, Spain can be cut into an interesting gemstone.[ Faceted andalusite stones give a play of red, green, and yellow colours that resembles a muted form of iridescence,  although the colours are actually the result of unusually strong pleochroism.

Location - Andalusia, Spain

Group - Silica

R.I - 1.633 - 1.644

Hardness - 6.5 - 7.5



Website design and content 2009 L.H. Maynard.
This site is Copyright 2009 A.E.Ward & Son Ltd
Pictures Copyright 2001 International Colored Gemstone Association