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Very small single crystal of the extremely rare REE mineral chukhrovite-(Y) from the type locality and only one of the three known localities worldwide: Kara Oba, Karaganda Oblast, Kazakhstan.
Photo by David Hospital, via Wikimedia Commons, CC-BY-SA-4.0
Combined white-light photograph with shortwave UV photoluminescence image of a specimen of clinohedrite (orange PL), hardystonite (blue PL) and willemite (green PL), from Franklin, NJ. Specimen size: 11cm
Photo (C) 2003 James O. Hamblen (http://hamblen.ece.gatech.edu/uvminerals/). Reproduced with permission.