Grandidierite is a rare gemstone that was discovered in Madagascar in 1902. It is a blue-green mineral that is often found in association with other rare minerals such as Andalusite and Kyanite. Given its scarcity, there are no commonly used synonyms for Grandidierite. However, some commonly used alternative names include Green Moonstone and Hambergite. While these names are not technically synonyms for Grandidierite, they are often used interchangeably by gemstone enthusiasts to describe blue-green gemstones that resemble Grandidierite. Other gemstones that share similar characteristics with Grandidierite include Apatite, Aquamarine, and Blue Topaz.