d_day

Looks more like the other feller is the one what started the argument.

My money’s on slag used as ballast. No telling without more info though.

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The base is a quartz crystal cluster, the trunk of the tree is glass, and the “leaves” appear to be tumbled agates, but I can’t tell for sure.

Not a fossil, but definitely a nice chalcedony.

I didn’t see this last time I checked in. Thank you so much for your help!

Thank you so much!

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That doesn’t look at all like montana agate to me. On top of that, agate is very hard. It runs between 7 and 7.5 on the mohs hardness scale. If it were agate, it would have been much more difficult to cut than what you indicated.

Green crystals? Magnets have a slight reaction? Light grey powder when crushed? Sure sounds like basalt to me. Olivine (aka peridot) is often found in basalt. Again, it’s very hard to make an ID from pictures, so I’m not going to say 100% it’s basalt, but I’m certainly leaning in that direction. And some tips for cutting: Cutting very hard stones, and trying to cut too fast can glaze your blade. Basically, steel from the blade is dragged over the top of the diamonds, which greatly reduces their effectiveness. You can deglaze the blade by cutting a silicon carbide sharpening stone or old grinding wheel. This WILL accelerate wear, but will actually make the blade last longer.

Doesn’t look like anyone’s carved it to me. Looks like it was broken by geological pressures and lots of time. If my ID is correct, the stone in the middle is a remnant of whatever it formed on. It could be other minerals too. If you do a streak test and the streak is brownish black, then it’s probably psilomelane.

Looks like calcite from Mexico.

Looks like a fragment of botryoidal hematite to me. Could be a few other things though.

First one’s got me stymied. At first glance looks like a granite of sorts. Might be a quartzite. Can’t really tell. Can’t give a positive ID on the second one, but it looks like basalt to me.

Zooming in on your second picture it looks very much like horn coral. The only horn coral fossils I’ve seen have been composed of calcite which is quite soft. Makes me question my ID. Perhaps horn corals from some locales have been replaced with silica which is much harder, and perhaps that’s what you’ve got.