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Beach pebbles/rocks
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03-10-2016, 11:47 PM
WarDog
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Join Date: Mar 2013
Location: Maple Ridge, BC
Posts: 3,111
Blueish and smooth is probably sedimentary. Not an ideal choice. Neither is metamorphic, can contain metals. Best bet is rock forged from 'liquid hot magma' (Dr.Evil voice), which is Igneous.
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