Rock ID please? - The Planted Tank Forum
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post #1 of 3 (permalink) Old 12-20-2009, 08:40 PM Thread Starter
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Question Rock ID please?

Ok, I have no idea where to post this, so just wanted to note that heh.

So I found this rock in my box-o-fossils. It didnt look like a fossil or any matrix I've seen. It looks to be covered in quartz or some other "sparkly" mineral. My closest guess would be granite or somthing, but Id like to see if anyone else can give an ID before I wash it and put it in the tank. The pics are crap, somthing is wrong with my camera, and closeup pics are not its specialty anymore. D:

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post #2 of 3 (permalink) Old 12-20-2009, 08:51 PM
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OK, trust me, I'm a geologist ;-) . Basically, there are three possibiiities and granite is not one of them - it's an igneous rock, formed from molten rock, and fossils are found in sedimentary rock. Your rock may be limestone, dolostone, or chert (the last is a form of quartz). Get some vinegar and a piece of scrap glass. Drop some vinegar on the rock - if there is any fizz, you have limestone and the rock is not good for your tank. Next, see if it scratches glass. If it does, the rock is probably chert and thus is chemically safe for your tank - but chert has sharp corners, not good for the fish. If it does not scratch the glass, you have dolostone, and it is also unsuitable. So - chert is the best of the three but still not a wise choice.

Last edited by mosasaur; 12-20-2009 at 08:52 PM. Reason: Correct the typos
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post #3 of 3 (permalink) Old 12-20-2009, 08:58 PM Thread Starter
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well after examining it more it is quite porous(?) Similar to lavarock, with little pits and grooves. Ill test it out cause I reallllllly wanna put it in my planted tank and cover it with a moss or anubias or somthing. More than likely it will be covered and half buried, I just do not wanna put somthing in my tank that will bring the apocalypse to my water parameters LOL!

edit: well it wouldnt scratch a corona bottle...and my mom has zero vinegar in the entire house, so....poop LOL
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