Question Rocky Mountain Granite Substrate

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Dean

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I've got a really good lead on some substrate for my new 55 gal tank with an odd ballish theme including some Polka-Dot Loaches. A friend of mine has mineral rights for some mountains in colorado where he mines for gold flake. He has ton of 2 and 3 mm rocks from sifting. It contains mostly granite with quartz, garnet, and some shale. He did the vinegar test for me and said there weren't any bubbles or fizzing going on. Its fairly round but it does a some square like pieces in it. He said it looks really good with the grey,red,and clear quartz crystal in it, Do you guys thing that that will work well for my tank? Thanks for your thoughts.
 

Furallicah

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Shouldn't be sure they contain no limestone though that can kill fish. But boiling the substrate will help, and I dont think it would change the chemisty much. Keep an eye on water conditions though.
 

phishyitis

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I think shale has some oily properties,if you boil it it might release oil into the water.I am not a geologist but,I wouldn't risk it.There are way too many substrate choices to risk your fishes health.Just an opinion.
 
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Dean

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I'll look into shale more. I think it has similar properties as slate but, I'm no expert either. I do know that there's no limestone in it.
 

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Granite will raise the GH or the water over time. It depends on a few different things as to how much it will change it. In all honesty though the amount it will add to the GH shouldn't be so much that you can't control the effects through water changes. Limestone doesn't kill fish. It just raises the KH & thus PH within the tank. Shale is safe & will not change your water chemistry at all as is quartz. Most PH neutral substrates are quartz based. Boiling to remove any nasties is always a very good idea. You will need to be extra carefull that none of the gravel contains veins or flecs of metal which would be a worry if it is coming from a spot that is being mined for gold.
 
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Dean

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If there was any gold, my buddy got it out. He very meticulous. He said that there isn't any other metals in the gravel besides the gold flake he pans for.
 

Furallicah

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Gold doesnt really Oxodize a a high rate usually taking many years. Which is one reason it is so valuable. If it was in a saltwater tank it would still be fine after a long time. All people do who find it in the ocean is polish it a little and its as good as new. If it was silver that would be different it oxodizes a little faster then gold usually turning slightly greeny gray coloring and losing it metalic shine. But still just a polish and good as new. I dont think gold would do anything to your tank on the level of chemical alteration. But then again it also depends on what could possibly be mixed in with the gold.
 
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Dean

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its only granite, quartz, and shale. The gold (Au,real gold) flakes are mined out but i did see some gold flakes and dust.

so either way it should be ok?
 
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Dean

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Well, I tested the gravel (with a science teacher's help) using HCL. No bubbling or fizzing so it seems to be fine to use in my new aquarium. Thanks everyone for your input, I appreciate it.
 
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