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Thénardite is fluorescent, white in shortwave and yellow-green in longwave UV radiation. In humid conditions, thénardite progressively absorbs water and converts to the deca-hydrated mineral mirabilite, Na 2 SO 4 · 10 H 2 O.
Agrellite displays pink fluorescence strongly under shortwave and weakly under longwave ultraviolet light. [5] [6] The fluorescent activator is dominantly Mn 2+, with minor Eu 2+, Sm 3+, and Dy 3+. [6] It is named in honor of Stuart Olof Agrell (1913–1996), a British mineralogist at Cambridge University.
In addition to the eponymous fluorspar, [66] many gemstones and minerals may have a distinctive fluorescence or may fluoresce differently under short-wave ultraviolet, long-wave ultraviolet, visible light, or X-rays. Many types of calcite and amber will fluoresce under shortwave UV, longwave UV and visible light.
Sodalite (/ ˈ s oʊ. d ə ˌ l aɪ t / SOH-də-lyte) is a tectosilicate mineral with the formula Na 8 (Al 6 Si 6 O 24)Cl 2, with royal blue varieties widely used as an ornamental gemstone. Although massive sodalite samples are opaque, crystals are usually transparent to translucent. Sodalite is a member of the sodalite group with hauyne ...
Optical properties of common minerals Name Crystal system Indicatrix Optical sign Birefringence Color in plain polars Anorthite: Triclinic: Biaxial (-) 0.013
Specimens from the Franklin Mine are fluorescent red in longwave ultraviolet light. [4] Not radioactive: References [5] ... Bustamite is a triclinic mineral, ...
The mineral is uniaxial (-), with refractive indices n ω = 1.638 to 1.655 and n ε = 1.632 to 1.650. [ 4 ] [ 5 ] It is sometimes fluorescent , white to blue-white or yellow-white in short-wave ultraviolet light, and medium white-yellow-brown or weak white in long-wave light.
Scheelite is a calcium tungstate mineral with the chemical formula Ca W O 4.It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786).