Fluorescence and Mineral Analysis:

Various minerals such as calcite, rubies fluorite, and zircon on exposure to UV radiation begin emitting fluorescence. The only need being in which the substances inhibiting and quenching fluorescence have to be absent. e.g., gypsum (CaSO_{4 2}H₂O), one of the general minerals within sediment environments exhibit red fluorescence on exposure to UV radiation. Same, the phosphate mineral e.g. Zircon displays fluorescence on exposure to UV radiation. The feldspar, autunite and scheelite -the minerals holding silicon, uranium and molybdenum correspondingly, show bright fluorescence.

Amongst fluorites the mineral willemite displays fluorescence within the present of S block metals. A few crystalline materials absorb light within the UV region and emit in the visible region. Within fluorescent lamps, the ultra-violet radiation from low-pressure mercury arc (Hg vapor emit light at 253 and 184 nm) is converted to visible light through calcium halo-phosphate phosphor (Ca₁₀F₂P₆O₂₄). The crystalline materials emitting fluorescence are refered to as crystallophosphors.  Several vanadates oxyhalides, oxides, etc. display fluorescence as matrices. Table lists application of crystallophosphor for analysis of metal ions.