File:Museo de La Plata - Ónice calcáreo.jpg

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Español: Ónice calcáreo. Compuesto por calcita fibrosa o acicular de grano muy fino. La intensidad del color verde se debe a una mayor o menor presencia de óxido de hierro (FeO). La formación de estos depósitos esta vinculada a la circulación de aguas termales con temperatures menores a 100˚C y altos contenidos de ácidos carbónico, así como calcio, magnesio, hierro y magnaneso. Estas aguas asciended a través de grietas, y depositan el ónix calcáreo en mantos o bancos. Esta pieza se ha formado durante los procesos volcánicos del Terciario que dieron lugar a la formación de cerro Tiporco. Tecnológicamente es conocido como mármol ónix. Cantera Santa Isabel, San Luis, Argentina.
Date
Source Onice calcáreo
Author Beatrice Murch from Buenos Aires, Argentina

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This image was originally posted to Flickr by blmurch at https://www.flickr.com/photos/82439748@N00/3543516604. It was reviewed on 21 May 2009 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

21 May 2009

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current19:30, 20 May 2009Thumbnail for version as of 19:30, 20 May 20093,872 × 2,592 (2.41 MB)Barcex (talk | contribs){{Information |Description= {{es|Ónice calcáreo. Compuesto por calcita fibrosa o acicular de grano muy fino. La intensidad del color verde se debe a una mayor o menor presencia de óxido de hierro (FeO). La formación de estos depósitos esta vinculada

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