Tourmaline : AD3G6 (T6O18)(BO3)3X3Z
Quartz : SiO2
Photo added to mindat.org
“Tourmaline on Quartz - Mawi Mine - Nuristan - Afghanistan - Quartz 7 cm, tourmaline 5,2 cm”
Christophe Gobin - 5th September 2009
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