Warning: The magic method __isset() must have public visibility and cannot be static in /home/lithicub/domains/lithicub.net/public_html/litoteca/library/Zend/Config.php on line 184
Warning: The magic method __unset() must have public visibility and cannot be static in /home/lithicub/domains/lithicub.net/public_html/litoteca/library/Zend/Config.php on line 194
(petrografia): Agregat en forma de raïm. Les formes esfèriques estan
constituïdes per cristalls fibrosos de radiolaris. Aquest tipus d’estructura és
freqüent en roques concrecionades, sobretot carbonatades, silícies o
ferruginoses.