What are these rocks?
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Old 10-14-2012, 02:54 AM   #1
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What are these rocks?


The ones on the first post of this thread:
http://www.plantedtank.net/forums/sh...d.php?t=190638
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Old 10-14-2012, 03:17 AM   #2
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Interesting rocks. Where are they from originally?
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Old 10-14-2012, 03:23 AM   #3
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They were found in TN.
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Old 10-14-2012, 04:11 AM   #4
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I want to say limestone, but I don't have much reason other then the color/shape of the rock.

Are there barnacles on the rock?
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Old 10-14-2012, 03:11 PM   #5
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I would assume those are a pretty soft type of limestone. Looking closely, can you see any of the little fossil critters which they are made out of? If they were collected along a shoreline, the rough texture might be something that is left of algae and might scrub off after a bit.
If they are local rocks, and your water is already hard and alkaline, there is no reason to think they wiill change your water much. If they are local rocks, people tend to forget that is what the water spends much of it's time in already. If you take them to some place where the water is PH 6.5, it will change the water more but fish and plants can handle that if you are not picking the fussy types.
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Old 10-14-2012, 05:43 PM   #6
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They are local rocks from a lightly used seasonal stream bed. The local water runs around pH 7.6, GH 7-8, KH 6-7 and limestone is prevalent. However these rocks passed the white vinegar test so I'm planning to use them with neo shrimp and moss.

Adding a few tigers might be possible later so I'm going to put them in distilled water for a few days, then check TDS and other parameters.

There are hemispheric nodules on some of the rocks. There are no obvious fossils although there is one anomalous area on the largest one.

I can provide better pics if needed.
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Old 10-14-2012, 06:49 PM   #7
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Vinegar is not the greatest test material as it is a very weak acid. Ideally you would want to use something stronger like muriatic acid (diluted HCl).

When you tested it, did you scratch the surface? You will get a better result if you scrape the rock into a powder before applying the acid because it exposes fresh surface and increases the exposed surface area coming in contact with the acid.

This rock certainly seems like it is a limestone, the white color, the powdery look, it looks to be easily eroded. The fact that tennesse has ALOT of limestone in it and the water nearby is such a high pH suggests that this is a limestone.

The TDS meter will be the best bet to tell, and my inclination is that the TDS will skyrocket in the distilled water.
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Old 10-14-2012, 06:55 PM   #8
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Quote:
Originally Posted by tharsis View Post

The TDS meter will be the best bet to tell, and my inclination is that the TDS will skyrocket in the distilled water.
How long should I wait before testing?
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Old 10-14-2012, 07:18 PM   #9
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looks like sandstone.
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Old 10-14-2012, 07:52 PM   #10
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Attempting to scratch one with a knife yielded only very faint marks, if that. Nothing flaked away.
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Old 10-17-2012, 03:42 PM   #11
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TDS of the two biggest pieces in DI water was 24 after 24 hours; after 60 hours it was only 26. I assume this means it's reaching equilibrium but I'll continue testing until 7 days have passed.
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Old 10-19-2012, 11:19 PM   #12
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I worry very little about rocks when I collect them from the local water and put them in the local water. For my purposes if they have been in the local water and not changed over the last few million years they are not likely to change the water in my tank before I get around to doing a water change to reduce/remove anything they are doing to the water.
I'm slow but I do get my water changed at least once every few years!!
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Old 10-20-2012, 12:42 AM   #13
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Point taken...I'm starting to really like the idea of tigers though and that involves RO/DI.

These rocks haven't been boiled, only rinsed, so it's possible the TDS reading is from crud I missed.

Reading is up to only 28 after 96 hours.
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