How to break a freakin' hard rock? - The Planted Tank Forum
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post #1 of 23 (permalink) Old 01-30-2008, 12:42 AM Thread Starter
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How to break a freakin' hard rock?

I found this 17 lb geode rock at the landscaping store that looked pretty cool but is pretty big...

I tried dropping it, smashing it with a sledge hammer but nothing but a little dent and sparks.. It's one freakn' hard rock. It doesn't look like elbow grease is going to do it.. It'll need some brains.

Any suggestions on how to split this thing?


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post #2 of 23 (permalink) Old 01-30-2008, 12:44 AM
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Hit it harder with a bigger sledge. Maybe a large chisel and sledge. Might be hard to find someone willing to hold the chisel.

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post #3 of 23 (permalink) Old 01-30-2008, 12:45 AM
 
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What are the dimensions? Or at least the general shape? That matters more than the weight. A round rock is a heck of a lot harder to break than a thin flat rock.
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post #4 of 23 (permalink) Old 01-30-2008, 12:46 AM
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post #5 of 23 (permalink) Old 01-30-2008, 12:47 AM
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Just don't throw it down into your sidewalk... I cracked a big 18" square paver block in half trying to reduce the size of a piece of slate. I had no idea it was actually that hard. Same goes for sledging it, of course, hehe.
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post #6 of 23 (permalink) Old 01-30-2008, 12:50 AM
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Drill a line of holes with a carbide tipped drill bit. Put "feathers and wedges" into the holes. They are shims with a wedge between them. Hit the wedges one at a time. The feathers will force the rock apart, and you will get a nice clean split, and it will split where you want it to.

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post #7 of 23 (permalink) Old 01-30-2008, 12:51 AM
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hit it with another rock?
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post #8 of 23 (permalink) Old 01-30-2008, 12:51 AM
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Maybe heat it (REALLY hot) and try the sledgehammer again

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post #9 of 23 (permalink) Old 01-30-2008, 12:55 AM
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Quote:
Originally Posted by footbeat View Post
Drill a line of holes with a carbide tipped drill bit. Put "feathers and wedges" into the holes. They are shims with a wedge between them. Hit the wedges one at a time. The feathers will force the rock apart, and you will get a nice clean split, and it will split where you want it to.
Well said, but a carbide bit is not something someone always has laying around and this is also a bit labor intensive. But great thought!


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post #10 of 23 (permalink) Old 01-30-2008, 12:56 AM
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You have any kind of tongs that will pick up something that big? Build a fire and toss it in for a couple of hours, and when it's really hot, drop it in really cold water. Watch out, though, might blow up.

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post #11 of 23 (permalink) Old 01-30-2008, 12:59 AM
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out of curiosity what makes you believe it a geode? if it is a geode find a seam where the Qtz is poking through and drive a chisel in to it and hit it as hard as you can. or you could do what i have done in the past and rent a wet demo saw from your local equipment company. this will provide a nice strait line as long as you can cut a strait line. if this rock is of Utah ,Arizona Montana or New Mexico in origin this will work if the geode is a Brazilian these geodes normally require a oil based wet saw that cuts incredibly slow due to there density
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post #12 of 23 (permalink) Old 01-30-2008, 01:16 AM
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Look in your phone book yellow pages for a business that creates Grave markers or Monuments for cemeterys, and give them a call. I'm sure they can help.
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post #13 of 23 (permalink) Old 01-30-2008, 01:22 AM Thread Starter
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Quote:
Originally Posted by footbeat View Post
Drill a line of holes with a carbide tipped drill bit. Put "feathers and wedges" into the holes. They are shims with a wedge between them. Hit the wedges one at a time. The feathers will force the rock apart, and you will get a nice clean split, and it will split where you want it to.
this man has got brains ^^^^^^^

it's a round geode the size of a football. I know it's a geode because it came from the 'florida geode' bin. The outter shell looks like a metamorphic rock, not like the typical silica.


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post #14 of 23 (permalink) Old 01-30-2008, 01:32 AM
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cool geodes are great i collect them when ever i go out west on vacation. i didn't know Florida had geodes being that nearly the entire state is lime stone or sand i wasn't aware there were any metamorphic close the surface. i relay hope its a geode and not a concretion. just a side note if u try the carbide drill bit check the hardness of carbide be cause i know Qtz is seven

i just did a quick look up of Florida geodes there agatized corals or Qtz covered corals. at lest according to the quick search i did
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post #15 of 23 (permalink) Old 01-30-2008, 01:32 AM
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Take a walk around some construction site and ask the guy with the jackhammer for a favor. Bring a sandwich
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