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Old 02-01-2009, 07:13 PM   #1
oldpunk78
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help w/rocks


i found these in the Oakland hills the day. then i thought, oh man, those would look sweet in a tank. pic:


the one i kinda cleaned up passed the vinegar test. i'm still a little suspect though. i'll have to get some of the right stuff to test it with...

anyway

they have a sandy feel to them. they have been weathering on top of a of a rock pile overlooking the bay area for who knows how long. i'll have to clean up the moss and stuff. (notice how the one is green.)

what do you guys think? any ideas of what this rock is?
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Old 02-01-2009, 07:49 PM   #2
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Oh man, it's been a while since I've had geology. But the only rock that I can remember having a sandy texture is sand-stone. Sandstone itself can be a conglomeration of several types of minerals that are cemented together. It tends to be composed of clay, calcite, and silica, all of which are fairly chemically inert. I believe the "vinegar test" really shows if the rock contains calcium carbonate, Ca CO3, which would up your KH. If you want to test for that use a HCl solution, I believe someone said that one of the API tests was a HCl solution. But I believe that most rocks that contain Ca CO3 are white in color, I also believe that sandstone, if that's what this is, contains almost exclusively sand, Silica Dioxide, which makes it just like putting sand in your tank.

They do look really cool though, especially the one on the right with all those fractures and such.
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Old 02-01-2009, 07:55 PM   #3
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Oh yeah, here it is API Nitrate test bottle #1, in this thread

But since you posted in that thread several times I guess you probably know that, guess it could possibly help someone else reading.


Now that I think about it some, I guess it could also be siltstone, then it's be mostly clay, but the grain sizes are fairly large, so I'm going with sandstone.
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Old 02-06-2009, 11:01 AM   #4
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I like the green, I would leave it. I also like the stone on the right. It looks like a butte from Arizona.
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Old 02-06-2009, 04:50 PM   #5
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from what i can see through the alge the rocks on the right are a granite the black specs are biotite which is meta minerl which will be fine for a tank and in some ways can be benoficial for planted tanks being that it weathers easoly and will leach trace minerals into the water collum. i dont see any veighning on the rocks so they apear to lack any hydrothermaly deposited metals which are easoly soluble in h2o.

the rocks on the left apear to be the same or they could be a dirty graywackey which will have feldspar inclusions. which will be safe for aquarium use. agin this could be bennificial in that the feldspars can leach K into the water in addition to Na but at such low levels it would have no impact on silinity.

hope this helps
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Old 02-07-2009, 08:13 PM   #6
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Quote:
Originally Posted by metageologist View Post
from what i can see through the alge the rocks on the right are a granite the black specs are biotite which is meta minerl which will be fine for a tank and in some ways can be benoficial for planted tanks being that it weathers easoly and will leach trace minerals into the water collum. i dont see any veighning on the rocks so they apear to lack any hydrothermaly deposited metals which are easoly soluble in h2o.

the rocks on the left apear to be the same or they could be a dirty graywackey which will have feldspar inclusions. which will be safe for aquarium use. agin this could be bennificial in that the feldspars can leach K into the water in addition to Na but at such low levels it would have no impact on silinity.

hope this helps
I'm going to start collecting rocks and posting pictures just to give you a work out. Thanks for the always educational read.
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Old 02-08-2009, 10:36 PM   #7
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I think you should use these rocks as the focal point for your scape with lots of smaller rocks covered in moss or algae around it..... this is in response to your other thread about scaping.
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Old 02-08-2009, 11:07 PM   #8
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Quote:
Originally Posted by prototyp3 View Post
I'm going to start collecting rocks and posting pictures just to give you a work out. Thanks for the always educational read.
i look forward to this i dont get to use my knowlwge or rocks very much doing environmental geology since most gas stations are built on fill and i am usioly only worried about the water and how the soil influences the water table not what the bed rock is unless its close to the ground
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