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Tourmaline (Dravite variant)
An example of the element Silicon

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Silicon Tourmaline Dravite variant
Tourmaline (Dravite variant).
I'm not sure why I have this mineral: I think it may have been a free sample included with some other mineral purchase. Lovely, though of relatively undistinguished chemical composition.
Source: Theodore Gray
Contributor: Theodore Gray
Acquired: 20 September, 2005
Price: Donated
Size: 1"
Composition: NaMg3Al6(BO3)3[Si6O18](OH)3(OH)
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