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I would not use them. Im no rock expert but they dont look like one rock. They look like shells being held together by sand or some kind of sediment. That type of rock will harden water at a higher rate than denser rock. Also the patern on the rock does not look natural. Stones for an Iwagumi usually look like miniature mountain formations. Nice rocks though but in my opinion they are not ideal Iwagumi stone. Hope I don't come on harsh or arogant, its just my honest opinion.:thumbsup:
 
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