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Electron microscope observations of opaline silcretes found in the playa of a Miocene shallow lake reveal new opal CT microstructures. These microstructures are made up of fibres, filaments or rods, which are formed, in tum by coalesced microspheres or microhemispheres (0,1-0,2 &#194;&#181; diameter). They are up to 10 &#194;&#181; in length although larger ones could exist. They are straight, bent, wavy or even hairpin shaped. These microstructures comprise part of the opaline mass of the silcretes and are very similar to both neogenic opaline structures which are formed by bacterial intluence and to silicified biofilms. Therefore microbial mediation could exist in the genesis of this opal CT, although a possible inorganic origin by silicification of sepiolite is also considered.  Un estudio mediante MEB de silcretas miocenas opalinas formadas por silicificaci&#243;n de playas en un ambiente de &#194;&#171;playa-lake&#194;&#187; pone de manifiesto la existencia de una nueva microestructura de &#243;palo CT. Esta microestructura denominada en general fibrosa, se manifiesta por la presencia de multitud de fibras, filamentos o varillas formadas por la alineaci&#243;n de microesferas o microhemisferas que presentan un di&#225;metro entre 0,1 y 0,2 &#194;&#181;. Las fibras, filamentos o varillas tienen formas variables: rectas, curvadas, onduladas y &#194;&#171;en horquilla&#194;&#187;, y presentan longitudes de hasta 10 &#194;&#181;, aunque podr&#237;an existir longitudes mayores. La disposici&#243;n organizada de las microesferas en filamentos o fibras, constituyendo la masa general del &#243;palo, y su parecido con microestructuras opalinas que han sido formadas por influencia bacteriana, hacen considerar esta hip&#243;tesis, aunque no se puede descartar totalmente un origen inorg&#225;nico por silicificaci&#243;n de sepiolita

Una nueva ultraestructura de ópalo CT en silcretas. Posible indicador de influencia bacteriana