The Planted Tank Forum - View Single Post - Help with rock identification
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post #3 of (permalink) Old 01-23-2013, 07:52 PM
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Join Date: Jan 2012
Location: Oakland, CA
Posts: 2,318
I think you found the right wiki page for it.

I wouldn't stick it in an aquarium. gypsum won't hold up to water, and even if it doesn't affect your water pH/hardness, it will breakdown/dissolve. And that looks like a pretty nice sized piece. It would be a shame to see it damaged/destroyed.
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