Red substrate = iron rich? - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-31-2006, 01:36 AM Thread Starter
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Red substrate = iron rich?

Guys would like to know if any substrate with red coloration indicate that the substrate is rich in iron?

since red soil is rich in iron right so would it be the same with any substrate?
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post #2 of 10 (permalink) Old 03-31-2006, 01:58 AM
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Now stop and think about it. Red crushed glass?

It's red.
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post #3 of 10 (permalink) Old 03-31-2006, 03:32 AM
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Random Thought inspired by this thread...

Wouldn't it be cool if we could go to Mars and harvest some of the red Martian soil and bring it back to put in our fish tanks? That stuff is so red, it has to be full of iron.

Of course that would qualify me as the biggest Substrate Geek ever and cost a few billion dollars.
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post #4 of 10 (permalink) Old 03-31-2006, 03:33 AM
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color dont matter you can get fake red colored gravel that has no iron.

flourite red just happens to be red and is suppose to be high in iron
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post #5 of 10 (permalink) Old 03-31-2006, 04:03 AM
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Come on guys, It is a pretty legit question. Yes there are other reasons for a substrate to be red, but as iron oxidizes it does turn reddish (rust) colored. So I don't think it is just chance that flourite has the red color, instead, I would think it is due to the iron.

Do all high iron substrates have the reddish color though?


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post #6 of 10 (permalink) Old 03-31-2006, 04:18 AM
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Onyx Sand has 2846 mg/kg of Iron and its not Red
Lava flow in hawaii is high in Iron and when it cools its dark grey not red.

I would say not all substrates high in color are red. Some but not all.
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post #7 of 10 (permalink) Old 03-31-2006, 04:40 AM
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Quote:
Originally Posted by dschmeh
Onyx Sand has 2846 mg/kg of Iron and its not Red
Lava flow in hawaii is high in Iron and when it cools its dark grey not red.

I would say not all substrates high in color are red. Some but not all.

Thanks! Both are good examples of non red, but Iron rich materials.


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post #8 of 10 (permalink) Old 03-31-2006, 05:20 AM Thread Starter
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thanks for the information bro's

also sorry if you think that my question is somewhat stupid but im just a newbie anyhow
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post #9 of 10 (permalink) Old 03-31-2006, 01:16 PM
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How about dark red clay? Likely to be good quality laterite... for the bottom part of course.


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post #10 of 10 (permalink) Old 03-31-2006, 01:23 PM
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I found a good website:
http://soils.usda.gov/education/reso...lessons/color/

In addition to red, Iron can also cause the soils to turn yellow, or gray. So while Iron does affect the color of the soil, however as noted, other chemicals can overshadow this color, making the soil (substrate) black, or some other chemical.


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