Fluor-liddicoatite

Fluor-liddicoatite is a rare mineral species belonging to the tourmaline group. It was first described in 1977 and named after Richard T. Liddicoat, a prominent gemologist. Fluor-liddicoatite is a calcium, aluminium, borosilicate mineral with the chemical formula Ca(Li2Al)Al6(BO3)3Si6O18(OH)3F. It is characterized by its vibrant colors, which can range from pink to green, and its high refractive index.

History

Fluor-liddicoatite was first described in 1977 by mineralogist John Sinkankas. It was named in honor of Richard T. Liddicoat, a gemologist and former president of the Gemological Institute of America. The mineral was initially discovered in Madagascar, and has since been found in other locations around the world.

Physical Properties

Fluor-liddicoatite is a trigonal mineral, meaning it has three axes of symmetry. It has a hardness of 7-7.5 on the Mohs scale, making it a relatively hard mineral. Its refractive index ranges from 1.62 to 1.64, which is higher than many other minerals in the tourmaline group. The mineral's color can vary widely, from pink to green, depending on the specific chemical composition.

Occurrence

Fluor-liddicoatite is primarily found in pegmatite deposits. It has been discovered in several locations around the world, including Madagascar, Brazil, and the United States. The mineral is often associated with other minerals, such as quartz, feldspar, and mica.

Uses

Due to its vibrant colors and high refractive index, fluor-liddicoatite is often used as a gemstone. It is particularly prized for its pink and green varieties, which are highly sought after by collectors and jewelers alike.

See Also

• Tourmaline
• Gemology
• Mineralogy