I grow crystals directly on sculptures keeping them in the solutions. I have only partial control over the process. So crystals usually make decisions for their own how they grow. The process of crystallization takes time. The result is always a surprise.
I use stable types of crystals. They can live without any changes for many decades, with proper care – forever. Care is the key moment. These crystals do not have the property of crumbling or turning into dust with time. They can only slightly change the transparency several decades later. But even these barely noticeable, minor changes in the distant future can be prevented. Just follow rules to keep crystals in their original state forever:
Please, treat works carefully. Works must be stored indoors only. Keep crystallized works away from direct sunlight and water. These crystals are soluble in water. Be careful, do not expose them to water or other liquids. Ideally, I recommend isolating crystallized artworks into display boxes, domes, or frames (depending on the form of the piece) to protect them from dust, differentials of temperature, sunlight, and moisture. Limiting the impact of these external factors allows keeping crystals in their original state forever.
Crystals are strong enough. But they are still more fragile than stones. I’d say they mostly behave like gentle glass. I strengthen them additionally. But still, be careful, do not drop them. If that accidentally happened, super glue or any transparent glue for glass works just fine.
Crystals are non-toxic. But they are still NOT EDIBLE.
Please, do not taste them. As well as other parts of artwork by the way:)