Small but really nice specimen, consisting of blue spinel (bright red fluorescence under longwave UV), along with some unknowns, fluorescing respectively yellowish under midwave and shortwave, and bright blueish-white under shortwave, on feldspar (very dim reddish fl under SW); Lục Yên District, Yên Bái Province, Vietnam
24 mm X 18 mm X 11 mm
Shown below: longwave UV, midwave UV (310 nm LED), shortwave UV (255 nm LED), Visible light.
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