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I always surmised the way it happens is the rock matrix wears away making slurry and the garnets are exposed at the top and do their cutting and eventually they have to come lose and fall out and get...

If the coticule releases the garnets then the rock around it becomes weaker and it would begin to crumble which is why over time even a coticule needs to eventually be lapped. It's in a way like...

This is a very complex subject. First of all a Coticule is a metamorphic rock meaning it's subjected to heat and pressure so if any intact garnets were there they would most likely be all deformed or...