Black Specs in my pool filter sand - The Planted Tank Forum
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post #1 of 4 (permalink) Old 06-10-2009, 11:29 PM Thread Starter
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Black Specs in my pool filter sand

Hello; I recently purchased this pool filter sand. As I was filling my tank I noticed that there are quite a few black specs in it. Upon closer inspection I noticed that these specs are flat, and fairly shiny. I have attached a picture (sorry about the poor quality).

Does anyone have any idea what these are, and if they are dangerous to fish/plants or not.

Thank You
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post #2 of 4 (permalink) Old 06-10-2009, 11:52 PM
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Nepheline syenite is a form of rock similar to granite, but low in silica. It may contain many other minerals, some of which, according to Wikipedia, are black. But, it is an igneous rock, so I doubt that any of the minerals is more than very, very slightly soluble in water. I wouldn't worry about it.

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post #3 of 4 (permalink) Old 06-11-2009, 12:24 AM
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since it is a syenite the black specs are most likely biotite especioly since they are flat. these will have no ill affets on the fish

GEOLOGY Rocks Have A Gneiss Day
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post #4 of 4 (permalink) Old 06-11-2009, 01:30 AM Thread Starter
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Thanks for the quick responses!
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