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post #8 of (permalink) Old 02-09-2010, 10:30 AM
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Originally Posted by xev11 View Post
Is this rock safe for aquarium use? I found it near my apartment building. I googled rock types and this looks sort of like Quartz diorite.
your rock is actioly a quarzite with what apears to be a mica band making what is comonly called the manhatan shist.

GEOLOGY Rocks Have A Gneiss Day
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