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Is the gypsum relatively solid compared to limestone or does it crumble easily with percolation or to touch?
Gypsum is pretty fragile rock. Easily scratched with the finger nail and broken. It's generally formed from shallow seas. I'm not completely certain, but I imagine that once the rock is saturated it would crumble fairly easily with percolation.
You are right, gypsum dissolves very quickly, and falls down like a snow with percolation. You can see these 'snowflakes' on some photos. In distant parts of the cave we had to get shots "non stop" - if we stayed in place for some time, visibility would fell down. But there are not only simple gypsum but dolomites, ahydrites - they are not so fragile.
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