Photo of the Day

This photo shows an attractive combination of fluorescent scheelite and powellite from the Golconda Summit locality, Nevada, USA.

The scheelite produces a blue/ white colour under short wave UV light whilst the powellite fluoresces a bright yellow colour.

The two minerals are actually end members of a series of minerals with scheelite being a calcium tungstate and powellite being a calcium molybdate.

This particular specimen is currently for sale on my latest eRocks auction.