The Planted Tank Forum - View Single Post - Bought some rock today.....need ID
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post #4 of (permalink) Old 02-21-2013, 10:40 PM
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Join Date: Jan 2012
Location: Oakland, CA
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the way it's weathered looks somewhat like limestone (which also fits with the acid test) possibly some sort of marble? it looks like it's been recrystalized, so maybe some sort of low-grade metamorphism. It's been a while since I've done any geologing, so...

Odds are it will raise pH and hardness, may not be an issue for you, especially if your tap water is already hard.
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