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Cuprian-powellite (powellite-Cu)

Cuprian powellite: Jardinera No. 1 Mine, Inca de Oro, Chañaral Province, Atacama Region, Chile.

The yellow fluorescence of powellite, which is intrinsic, is colored slightly greenish by traveling through the crystal mass. Just like sunlight is colored by stained glass. You can look at the spectrum (or download it) here.

Source: Fluorescent Minerals Workgroup MKA

Strong fluorescence in SWUV as with normal powellite, just somewhat greener

Copper colors the powellite green

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