File:Spectrum natural blue spinel iron.jpg

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Spectrum of blue natural spinel (colored by iron). By Doos

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current10:41, 24 August 2007Thumbnail for version as of 10:41, 24 August 20071,188 × 262 (14 KB)Doos (talk | contribs)Spectrum of blue natural spinel (colored by iron). By Doos
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