Cleansing crystals with water is a powerful way to energetically cleanse & recharge them (and also helpful to remove dust if you've had them on display a while 
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However, not all crystals can be submerged or touched by water. Some will break apart, some will release toxins while others will dissolve.
Here's a little list of some crystals I use for our jewellery which you should not put in water:
| Selenite | All Calcites (honey, green, blue, etc) | Lepidolite |
| Celestite | Hematite Quartz | Malachite |
| Tanzanite | Blue Apatite/Golden Apatite | White Howlite |
| Pyrite | Labradorite | Kunzite |
| Rainbow Fluorite | Apophyllite | Astrophyllite |
| Sodalite | Rhodonite | Dumortierite |
| Danburite | Amazonite | Chrysocolla |
You can save this and look back on it whenever you feel the urge to submerge your crystals (this includes in the ocean).
General rule of thumb - any crystal ending in 'ite' just avoid putting in water.
These crystals in particular are 5 or below on the Mohs Hardness scale which is why they should not be put in water. The Mohs Hardness scale is a scale from 1-10 that tests the hardness of certain minerals by testing the resistance of them.