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post #1 of 6 (permalink) Old 03-27-2010, 07:45 PM Thread Starter
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How to test rock

I know this is a really simple question but, since I've never done it before, I dont know the answer.
How do you test a rock to see if its ok for your tank? I remember reading somewhere that you use vinegar but I dont know how much, or if there is some ratio to water. If you know, help me out please. I have an s-load of rocks around my house that I think would look great in the tank. I just dont know if their safe. Thanks.
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post #2 of 6 (permalink) Old 03-27-2010, 08:19 PM
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yes you can use strait vinegar on a rock to detect CaCO3 but a better solution is to use muriatic acid (found at lows, etc.) with the lower Ph you will get a stronger reaction.

if you don't get a reaction the next step is to place it in a bucket of tank water for a week or 2 and test the TDS, Ph, and kh on a regular basis looking for a change in water chemistry. and if this comes up clean it is most likely safe for use. and if you want you can post a picture of the rocks in question and I'm sure there is a geologist or two on here that will do there best to Id the rocks

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post #3 of 6 (permalink) Old 03-27-2010, 08:43 PM Thread Starter
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Ok, cool. I'll grab a couple of the rocks, take pic, and post it. Assuming I get the acid you spoke of, what "reaction" am I looking for? Thanks again.
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post #4 of 6 (permalink) Old 03-27-2010, 09:15 PM
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Quote:
Originally Posted by Guns286 View Post
Ok, cool. I'll grab a couple of the rocks, take pic, and post it. Assuming I get the acid you spoke of, what "reaction" am I looking for? Thanks again.
you are looking for any form of fizing.

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post #5 of 6 (permalink) Old 03-27-2010, 09:23 PM
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When you add the hydrochloric acid to rocks containing calcium carbonate, you will notice fizzing as the carbonate is broken down into carbon dioxide.

Be careful with the hydrochloric acid; at the very least, I would recommend gloves and goggles. The fumes are also a respiratory irritant, so be careful.

Anthony


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post #6 of 6 (permalink) Old 03-27-2010, 10:11 PM
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I test rocks with acid works great just make sure your outside . Also I found this site pretty good stuff on it http://www.rockhounds.com/rockshop/rockkey/index.html

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