Editing Geode (section)

== Crystal caves==
[[File:Amethyst and drusy quartz cathedrals in Crystal Mountain Museum.jpg|thumb|Very large [[amethyst]] and regular quartz geodes]]
'Crystal cave' is both an informal term for any large crystal-lined geode and also used for specific [[geoheritage]] locations such as the [[Crystal Cave (Ohio)]], discovered in 1887 at the Heineman Winery on Put-In-Bay, Ohio, the [[Cave of the Crystals]] (Mexico), and the [[Pulpi Geode]], discovered in 1999 in Spain. In 1999, a mineralogist group discovered a cave filled with giant [[Selenite (mineral)|selenite]] (gypsum) crystals in an abandoned silver mine, Mina Rica, near Pulpi, [[Province of Almeria]], [[Spain]]. The cavity, which measured {{convert|8.0|x|1.8|x|1.7|m}}, was, at the time, the largest crystal cave ever found. Following its discovery, the entrance to the cave was blocked by five tons of rock, with an additional police presence to prevent looters. In the summer of 2019 the cave, a significant [[geotourism]] resource and now named the 'Geoda de Pulpi', [[Pulpi Geode]], was opened as a tourist attraction, allowing small groups (max. 12 people) to visit the caves with a tour guide.<ref>{{Cite web|url=https://www.geodapulpi.es/Servicios/cmsdipro/index.nsf/informacion.xsp?p=Geoda&documentId=6964084B70F2F7E5C1258432003E19F5|title=Geoda de Pulpi|access-date=1 September 2022}}</ref>