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Post by snowmom on May 13, 2014 6:19:49 GMT -5
I am pretty sure the top left is conglomerate/breccia of some sort, the 3 smaller stones are serpentine, but not sure what the lighter green stone is... epidote/olivine? Seems to be the same color as the green in the unakite I have found.
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Post by snowmom on May 13, 2014 6:25:24 GMT -5
I should add that these were all pulled from Lake Huron and are quite beach worn. photographed wet, largest stone about 7 inches in length. I promise to do better on the photos... I'm learning!
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Post by snowmom on May 13, 2014 7:29:10 GMT -5
maybe have answered my own question.. my steel knife blade leaves a mark but doesn't scratch it, but it does leave a greenish grey streak on my plate, doesn't scratch the plate though. According to the little booklet I have, it may be massive diopside... ?
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Fossilman
Cave Dweller
Member since January 2009
Posts: 20,687
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Post by Fossilman on May 13, 2014 8:59:38 GMT -5
Not familiar with diopside,but those smaller serpentine's are cool..............(The lighter one could be a jasper)
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kradz89
starting to spend too much on rocks
Member since May 2014
Posts: 114
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Post by kradz89 on May 13, 2014 9:53:05 GMT -5
Olivine is more crystallized. It is the poor quality/small version of a peridot. I only know that because we live near one of the best sites for it in the country.
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Post by mohs on May 13, 2014 10:11:50 GMT -5
the big one could be forsterite anyway with those red crystals in it my new word is that its garnetizing
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Post by snowmom on May 13, 2014 16:28:31 GMT -5
Fossilman, I think the 2 smallest ones are serpentine for sure, they have the white lines/ strands of asbestos stuff through them. The center of the 3 smallest ones seems to have bumps that suggest to my vivid imagination they might be hiding denser rock inside (crystals?). I don't think any of them are glassy enough to be Jasper as much as I want it to be! Kradz 89, I think the inside of that rock might be darker green... I guess certain kinds of rocks when worn look way different than their 'natural' selves. I will have to wait for a saw or learn how to use a chisel to find out... Mr Mohs, it is definitely conglomerate, the other side has several large stones including one which looks like red jasper. I think the smaller red stones are all tiny shards of jasper, since they are not regularly formed the way a crystal would be. There are lots of light green and tiny white and dark green pieces of something too, so many the matrix seems to be almost lost, but seems to have been some sort of basalt- ish stuff, there is a chip on the end of it (other side) and it has a greyish cast that the rest of the rock doesn't. I wish I could get a photo that does that thing justice... it is a riot of small chips of colored stones with a few big ones thrown in. But I really wanted to try to figure out what that greenish yellow blocky one is... thanks for the input, if anybody has info to add, I'm all ears. : )
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Post by beefjello on May 13, 2014 19:22:42 GMT -5
Some nice looking greens there!
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Post by 150FromFundy on May 13, 2014 19:24:32 GMT -5
The light green is probably Epidosite. Epidote is a rock forming mineral. Epidosite is fairly common and varies in shade contingent upon the amount of Epidote it contains. Google search and check Images.
Darryl.
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Post by snowmom on May 14, 2014 3:38:15 GMT -5
150fromFundy I think you are right. It is the same color as the green in all the unakite I have piled up around here, and the books I have (for beginners) say that is epidote... but it makes sense that it is epidosite because none of it, in the unakite, or this piece has crystals... it all appears quartz/waxy. I think we have a winner. I will call it epidosite! thanks to everybody for helping me sort it out!
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