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First one is granite, so it's fine. Second says it's an igneous rock, but from the pic, I can't tell what kind. From what I see, it's severely weathered already, so it would be difficult to tell without a fresh surface. These obviously aren't the rocks you have, since they're from other people's links? Do you have pics of the actual rocks you have, because unless you're a geologist, it's difficult to tell the rock type from a picture. Even if you're a geologist (which I am) it's pretty tough from a shot like that.
 
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