▁Esp inha ço ▁Mountains , ▁Central - E ast ▁Brazil "   ), ▁XVI ▁Ge ow issenschaft liches ▁Late in amer ika ▁Kol lo qu ium ▁( 1 6 th ▁Ge ological ▁Latin - American ▁Col lo qu ium ), ▁Stuttgart , ▁ 2 0 0 0 . ▁ ▁Kar f unk el , ▁J ., ▁A . ▁G . ▁Bank o , ▁J . ▁Add ad , ▁M . ▁S . ▁D ant as , ▁M . ▁P iment a , ▁M . ▁Pin he iro , ▁K . ▁Kr amb rock , ▁W . ▁Had rian , ▁and ▁D . ▁B . ▁Ho over . ▁ 2 0 0 0 . ▁" High ▁P / T ▁sil ica ▁polym orph s ▁due ▁to ▁atmos pher ic ▁dis charg es ", ▁General ▁Sym pos ium ▁ 8 - 6 / ▁Min eral ogy , ▁Physics ▁and ▁Chem istry ▁of ▁Min er als , ▁XXX I ▁International ▁Ge ological ▁Congress , ▁Rio ▁de ▁Janeiro , ▁ 2 0 0 0 , ▁M 5 7 - M 5 7 . ▁ ▁Kar f unk el , ▁J ., ▁M . ▁V . ▁B . ▁Pin he iro , ▁K . ▁Kr amb rock , ▁F . ▁S . ▁L ame iras , ▁A . ▁G . ▁Bank o , ▁and ▁W . ▁Had rian . ▁ 2 0 0 0 . ▁" Tem per ature - time ▁ble aching ▁reaction ▁in ▁sm ok y ▁quart z : ▁nature ▁and ▁experiment ", ▁General ▁Sym p