Chatoyancy

[4] This alignment is attributed to the rutile's lattice parameter, which matches only one of the three orthorhombic crystal axes of chrysoberyl, leading to its preferred orientation in that direction.

aquamarine varieties), charoite, tourmaline, labradorite, selenite, feldspar, apatite, moonstone, thomsonite and scapolite amongst others.

This ‘figure’, which has a striking three-dimensional appearance, is highly prized by woodworkers and their clients alike, and is featured regularly in furniture, musical instruments, and other decorative wood products.

Figuring takes on a variety of forms and is referred to as flame, ribbon, tiger stripe, quilting, among other names.

Some methods have been proposed, such as one named PZC,[8] which was used to measure typical values for a number of wood species; some results are reported below:[9]