Liddicoatite

Liddicoatite is a rare mineral belonging to the tourmaline group. Its chemical formula is Ca(Li,Al)3Al6(Si6O18)(BO3)3(OH)4. It is known for its distinctive trigonal crystal system and prismatic habit, often occurring as prismatic crystals with striations parallel to their length. Liddicoatite is typically found in association with lithium-rich pegmatites, often in environments where other lithium minerals like lepidolite and spodumene are present. The mineral was first discovered in Madagascar and was named in honor of Richard T. Liddicoat, a prominent American gemologist and mineralogist. A unique characteristic of liddicoatite is its often striking color zoning, which can display a variety of colors, including pink, red, blue, green, and yellow, sometimes in distinct bands within a single crystal. This zoning can be quite complex and attractive, making some specimens desirable for collectors. Liddicoatite is relatively hard, with a Mohs hardness of 7 to 7.5, and has a vitreous luster. Due to its rarity and its often colorful and zoned appearance, liddicoatite is considered a valuable mineral specimen.