From a mineralogy viewpoint, feldspar is the most common mineral in the world. In fact, feldspar makes up nearly 60% of the Earth’s crust.
Sunstone is famed for its aventurescence. The intensity of this optical phenomena depends upon the size of inclusions present, which are typically composed of hematite or goethite. Smaller inclusions tend to exhibit more sheen, while larger ones generally appear as glittery metallic reflections. Sunstone is typically orange to reddish and its spangled appearance is reminiscent of the sun, hence its name “sunstone”. The main deposits for the stone come from India, Canada, Madagascar, Norway, Russia and the US.
Labradorite shows an optical phenonema called labradorescence, a white or bluish light seen when turned. It is the result of diffraction of light in the layers of rock. The most highly valued labradorite is the one that shows the full spectrum of color in its labradorescence. The gemstone that was named after Labrador in Canada, where it was found in 1770. It has since been found in other places, including Finland, Madagascar, and Australia.
Moonstone is a transparent to opaque gem, and is known to exhibit a distinct sheen under certain lighting conditions. This sheen renders moonstone one of the most remarkable gemstones available today. In fact, its name is owed to the bluish white shimmer it exhibits, which closely resembles that of the moon. This shimmering optical phenomena is called adularescence. The most important moonstone deposits are from Sri Lanka and India.