Difference between revisions of "File:Tourm104.jpg"
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Latest revision as of 09:41, 3 February 2010
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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