File:Spectrum natural blue spinel iron.jpg
From The Gemology Project
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Spectrum of blue natural spinel (colored by iron). By Doos
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 10:41, 24 August 2007 | 1,188 × 262 (14 KB) | Doos (talk | contribs) | Spectrum of blue natural spinel (colored by iron). By Doos |
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