05 September 2010

Watermelon tourmaline


Specimens from Brazil and Nigeria.   I was confused by seeing the chemical formula listed as:

AD3G6(BO3)3[T6O18]Y3Z

That is explained at Wikipedia (where it is listed as XY3Z6(T6O18)(BO3)3V3W).

1 comment:

  1. Texan99September 6, 2010 at 2:52 PM

    I posted some more about tourmalines at Grim's Hall (grimbeorn.blogspot.com), and boy, did I ring a bell with one of the regulars! We really enjoyed this post. She was even inspired to buy a membership in the Mineral of the Month Club.

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