Examples from the Web for labradorite
Like labradorite the sheen is visible only when the stone is held at a certain angle.
Like labradorite and anorthite, it is a common constituent of basic igneous rocks, such as gabbro and basalt.
Labradorite, the reader may know, is a crystallized feldspar, with traces of other minerals.
These lying in parallel position in great numbers in the labradorite give the colors.
Another feldspar sometimes seen as a semi-precious stone is Labradorite.A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public|Frank Bertram Wade