A large Labradorite pendantA heavy pendant , pear shaped containing labradorite. Measures 40x30mm. Labradorite occurs in Igneous rocks such as Basalt and Gabbro and also in metamorphic rocks such as Gneiss. It is a plagioclase feldspar mineral displaying an irridescent optical effect called labradorescence so as the stone is moved it responds by changes of hue and colour. This irridescence is due to light being diffused or scattered by the internal crystal structure consisting