This post is all over the place. I cut and pasted the information from Facebook. I'm NOT in the mood to fix it -- correct spacing, etc. lol
Selenite doesn't tolerate water. It'll disintegrate in water.
If in doubt about how to cleanse a crystal, a very safe & effective way is with high pitch sound vibrations such as Tibetan bells, chimes, or a singing bowl. That way you don't have to work about what's hazardous to your crystals.
Sunstone, and Shungite can be wet.
From Angel Herron A good general rule of thumb is to not submerge crystals with a MOH hardness level of 5 or less. Also if you are going to keep the crystal in the water for a long period of time, make sure it does not contain iron -- like Hematite, Magnetite, and Lodestone -- because it can cause them to oxidize.
http://www.crystalguidance.com/articles/cleansing.html
Amegreen, Amethyst, Ametrine, Apophyllite Green, Aquamarine, Auralite23, Celestite, Citrine, Fluorite, Hiddenite, Kunzite, Opal (will dry out), Prasiolite, Rose Quartz, Smoky Quartz, Spirit Quartz, Super Seven, Topaz, Turquoise.
From Angel Herron:Here are some examples. They do not exhaust the entire list of hazardous stones. First, crystals that contain copper or lead should never be used. This group includes Azurite, Malachite, Galena, Chalcopyrite, and others. Hematite as an iron based stone should not be put in water as prolonged exposure to water makes it rust. Some salt crystals dissolve in water, so they should be avoided too. Other stones, like for example Tiger's Eye, contain asbestos and likewise should not be used for charging water.
Special Handling of Certain Crystals
http://www.crystal-healing.org.uk/geology-and-crystal-healing/special-handling