File:Tourm104.jpg

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This round standard brilliant is a member of group that I call "droplets of color". They are all around 6mm or less in diameter and I cut them between larger gemstones to take a rest from the polish wars with the larger facets. This tourmaline is a fine orange that is bright and pure. I am sure that it came from Africa since oranges are rare for other parts of the world. My spectrometer shows absorption peaks that can be attributed to both Mn2+(maybe with Ti+4 or on its own) and Mn3+(oxidation states of titanium, Ti, and manganese, Mn) in the violet to green part of the visible spectrum. This absorption along with a low level of absorption of iron in the red part of the spectrum gives us a glorious orange.

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current21:09, 18 January 2010Thumbnail for version as of 21:09, 18 January 2010400 × 600 (16 KB)Barbra (talk | contribs)
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