--- Dear I will try to find what y want. Dr Ramadan On Mon, 11/9/09, calmeida <[log in to unmask]> wrote: From: calmeida <[log in to unmask]> Subject: Help - fibrous in gypsum To: [log in to unmask] Date: Monday, November 9, 2009, 9:12 PM Dear All, I am studing some geological aspects of the Araripe Basin in Northeast Brazil in my MSc dissertation. During the field mapping I noticed the presence of swarm of gypsum veins placed on carbonatic rocks. In most of them I observed gypsum fibers perpendicular to the veins walls, but in several places there are some with fibers parallel to the wall rocks. I am looking for papers and references that could help me to understand these situations, especcially the case of parallel fiber veins, that seems to me, to be not very usual. I appreciate if someone could help me. Thanks in advance. -- Camila De Almeida Belém - Pará - Brasil Caixa Postal 8608 - CEP 66075-110 Centro de Geociências - Depto. de Geologia Fone 0055 (91)32017393 Grupo de Geologia Estrutural - GES Universidade Federal do Pará