ultraviolet light

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Once again trying to identify quartz tubes amongst glassware. The UV lamp on the left is causing the paper to fluoresce green. The test tube clearly doesn’t block the UV light, however the glass stopper does.

Why does the quartz fluoresce blue slightly? I really don’t know… maybe the quartz contains trace amounts of another atom, like how gemstones are typically coloured?

From Mindat.Org Photo Of The Day; March 19, 2015:

Scheelite : Ca(WO4)

locality:Michigan Mine (Michigan Gold Mine), Diorite, Ishpeming, Marquette Co., Michigan, USA

A large fractured mass of scheelite to 4 cm in quartz from the Michigan Gold Mine. Collected by Travis Olds and Dan Fountain with the aid of a SWUV lamp at night. Canon T3i w/ mirror lock engaged EFS-60 FOV: 4.9 cm Diffused LED lighting Helicon Focus depth map