Editing Celestine (mineral) (section)

==Geodes==
Celestine crystals are found in some geodes. The world's largest known [[geode]], a celestine geode {{convert|35|ft|m}} in diameter at its widest point, is located near the village of [[Put-in-Bay, Ohio]], on [[South Bass Island]] in [[Lake Erie]]. The geode has been converted into a viewing cave, [[Crystal Cave (Ohio)|Crystal Cave]], with the crystals which once composed the floor of the geode removed. The geode has celestine crystals as wide as {{convert|18|in|cm}} across, estimated to weigh up to {{convert|300|lb|kg}} each.

Celestine geodes are understood to form by replacement of [[alabaster]] nodules consisting of the [[calcium sulfate]]s gypsum or anhydrite. Calcium sulfate is sparingly soluble, but strontium sulfate is mostly insoluble. Strontium-bearing solutions that come into contact with calcium sulfate nodules dissolve the calcium away, leaving a cavity. The strontium is immediately precipitated as celestine, with the crystals growing into the newly formed cavity.<ref>{{cite journal |last1=Anenburg |first1=Michael |last2=Bialik |first2=Or |last3=Vapnik |first3=Yevgeny |last4=Chapman |first4=Hazel |last5=Antler |first5=Gilad |last6=Katzir |first6=Yaron |last7=Bickle |first7=Mike |year=2014 |title=The origin of celestine-quartz-calcite geodes associated with a basaltic dyke, Makhtesh Ramon, Israel |journal=Geological Magazine |volume=151 |issue=5 |pages=798–815 |doi=10.1017/S0016756813000800 |bibcode=2014GeoM..151..798A |s2cid=129529427 }}</ref><ref>{{cite journal |last1=Carlson |first1=Ernest |year=1987 |title=Celestite replacements of evaporites in the Salina Group |journal=Sedimentary Geology |volume=54 |issue=1–2 |pages=93–112 |doi=10.1016/0037-0738(87)90005-4 |bibcode=1987SedG...54...93C }}</ref><ref>{{cite journal |last1=Kile |first1=Daniel |last2=Dayvault |first2=Richard |last3=Hood |first3=William |last4=Hatch |first4=H. Steven |year=2015 |title=Celestine-bearing geodes from Wayne and Emery counties, southeastern Utah: Genesis and mineralogy |journal=Rocks & Minerals |volume=90 |issue=4 |pages=314–337 |doi=10.1080/00357529.2015.1034489 |bibcode=2015RoMin..90..314K |s2cid=130452012 }}</ref>

<gallery mode="packed" heights="150">
Celestitemadagascar.jpg|Celestine geode section
Crystal Cave Ohio.JPG|Inside the Crystal Cave geode in Ohio
</gallery>