The geological type area for labradorite is Paul's Island near the town of Nain in Labrador, Canada. It has also been reported in Norway, Finland. Labradorite occurs in mafic igneous rocks and is the feldspar variety most common in basalt and gabbro. Labradorite can display an iridescent optical effect known as labradorescence. Labradorite is rated between 6 and 6.5 on the Mohs hardness scale. Labradorite is thought to sharpen intuition; enhance emotional depth, self-reflection and search for truth.