Rusty looking slate - The Planted Tank Forum
 
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post #1 of 4 (permalink) Old 04-03-2004, 01:53 PM Thread Starter
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Went to a local landscape supply place(x-quarry) and out of about 20 different kinds of slate, 90% looked rusty. The guy said they had mica in them. Is this good for aquariums? The 10% were more colored and really high priced. Jumped from .04 to .37 a lb. What kind of tests should be run? Thanks
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post #2 of 4 (permalink) Old 04-04-2004, 02:17 PM
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Buy little pieces of the slate you are intrested in and put them in a bucket and measure the changing water parameters if they change at all. Test for carbonates by scraching the rock and dabbing a weak (10%) solution of HCl. But if it really is slate you shouldn't have any problems.


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post #3 of 4 (permalink) Old 04-04-2004, 07:18 PM
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Pour vinegar on it, if it bubbles its no good if it doesnt its fine for the tank
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post #4 of 4 (permalink) Old 04-05-2004, 09:57 PM
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Down here in Arizona I've seen that stuff at a landscape store and was told its called Mexican slate, and is not aquarium safe. I forgot what mineral the rusty stuff was called, but the guy I talked to said it leeches into water. Sounds pretty similar to what you are describing. :?
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