Fluor-uvite is a tourmaline mineral with the chemical formula CaMg₃(Al₅Mg)(Si₆O₁₈)(BO₃)₃(OH)₃F. It is a rare mineral that is found in calcium rich

contact Contact may refer to: Interaction Physical interaction * Contact (geology), a common geological feature * Contact lens or contact, a lens placed on the eye * Contact sport, a sport in which players make contact with other players or objects * ...

metamorphic rocks with increased amounts of

boron Boron is a chemical element with the symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the ''boron group'' it has th ...

. Uvite is trigonal hexagonal, which means that it has three equal length axes at 120 degrees, all perpendicular to its fourth axis which has a different length. Uvite is part of the space group 3m. Uvite's hardness has been measured to be 7.5 on the Mohs hardness scale. The color of uvite widely varies, depending on the sample, but is mostly deep green or brown. In regard to uvite's optical properties, it is uniaxial (-) and anisotropic, meaning that the velocity of light in the mineral depends on the path that it takes. In plane polarized light, uvite is colorless to pale yellow and shows weak pleochroism. Uvite was first found in 1929 in

Uva Province Uva Province ( si, ඌව පළාත, Uva Paḷāta, ta, ஊவா மாகாணம், Uvā Mākāṇam) is Sri Lanka's second least populated Provinces of Sri Lanka, province, with 1,259,880 people, created in 1896. It consists of two dis ...

Sri Lanka Sri Lanka (, ; si, ශ්‍රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...

, hence the name. Uvite has no use, but is commonly found in mineral specimen collections. The mineral is sought after by collectors because of its pronounced colors, crystal structure, and often large crystal size.

References

{{reflist Aluminium minerals Calcium minerals Cyclosilicates Magnesium minerals Trigonal minerals Minerals in space group 160 Tourmalines