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Post by vegasjames on Oct 29, 2018 20:28:59 GMT -5
Might be. I've also seen similar rind on petrified wood and agates that formed in both caliche and rhyolite. You could test for limestone with a drop of muriatic acid (depending on hardness, you may get an instant bubble reaction or have to wait a bit and observe closely). Some caliche will fizz when exposed to acid, so not conclusive. Caliche is much softer than limestone, however. Caliche is a cement composed mainly of calcium carbonate. en.m.wikipedia.org/wiki/CalicheVegas should be called the caliche capital of the world as common as it is. When digging pools there is even a caliche clause that states if they hit the crap when digging the cost goes way up. They used to blast it, but now use ram hoes. I spent a couple of years digging out the caliche in my front yard with a pick, shovel and sledge hammer so the roots of the trees and other plants could go down. Hate the stuff.
Caliche is like a cement composed of calcium and magnesium carbonates. It will dissolve in acid, which is how I clean it off the rocks I collect.
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Post by MsAli on Oct 29, 2018 21:33:33 GMT -5
I can pretty much rule out that is what is on the outside. Dont think it is in Minnesota from what I can find. But I could be wrong
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