The Probert Encyclopaedia of Rocks & Minerals

LABRADORITE

Labradorite has the formulae (Na,Ca)AlSi3O8 and a relative hardness of 6. It is one of the plagioclase feldspars, also known as soda-lime feldspars. Others in the grouping are: albite, oligoclase, andesine, bytownite, and anorthite.
Labradorite often has a beautiful display of colours. The name is derived from the locality of Labrador.
Research Labradorite