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Beryllite The hydrous beryllium silicate beryllite occurs in white to pale tan, very fine-grained, thin crusts and masses to several cm across, but generally only a few mm. It is found in hydrothermally altered specimens partially coating surfaces of grains of tugtupite and associated species. Much material purported to be beryllite, is not.
Under shortwave ultraviolet, beryllite fluoresces blue-white to bluish-gray. The intensity of the response varies: some beryllite fluorescence is bright and appears blue-white; much is dim and appears bluish-gray. Unlike some other bluish fluorescing phases at Ilímaussaq, beryllite's luminescence spectra does not contain characteristic uranyl peaks. When brightly fluorescent, beryllite provides very attractive (if small) specimens—especially when associated with red-fluorescing tugtupite.
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