Roberta NJ CA Posted February 8, 2018 Share Posted February 8, 2018 Taking a break from my fossils (or whatever they may turn out to be) So I'm posting a few of my rocks I've collected over the years. I've lived in NJ, CA, OR, and spent time in other states so I'm not always entirely sure actually where I found some of them. This rock, Green Rock (go figure) I believe I dug out of my seawall in Pacifica, CA. It's odd in that the green parts are super shiny, yet matte, and the surrounding rock/sandy areas are holey and grainy. If anyone knows what this is please let me know; also would you recommend I cut it open? Thanks, Link to comment Share on other sites More sharing options...
izak_ Posted February 8, 2018 Share Posted February 8, 2018 Looks man made. Link to comment Share on other sites More sharing options...
Roberta NJ CA Posted February 8, 2018 Author Share Posted February 8, 2018 How and more importantly why so... what do you think it is made of and why would someone want to "make" this thing? I appreciate your input Link to comment Share on other sites More sharing options...
Brett Breakin' Rocks Posted February 8, 2018 Share Posted February 8, 2018 It looks a bit like Chert as well .. California has lots of it. Not sure about the green variety. But if you dug it out of boulders or Infill ? placed there from a quarry nearby. Cheers, B 1 Link to comment Share on other sites More sharing options...
izak_ Posted February 8, 2018 Share Posted February 8, 2018 3 minutes ago, Roberta NJ CA said: How and more importantly why so... what do you think it is made of and why would someone want to "make" this thing? I appreciate your input I'm by no means an expert, but I have seen similar 'rocks'. It looks similar to the slag that comes out of my nearby steelworks, with the perfect spheres inside and the iron staining. So I'm gonna say its slag of some kind. Sorry for not elaborating first. @ynot might know? 5 Link to comment Share on other sites More sharing options...
Roberta NJ CA Posted February 8, 2018 Author Share Posted February 8, 2018 Thanks for the clarification. Link to comment Share on other sites More sharing options...
Roberta NJ CA Posted February 8, 2018 Author Share Posted February 8, 2018 I looked around online with your details and found a similar photo of green "slag" - thanks again for your quick input and response. Roberta Link to comment Share on other sites More sharing options...
ynot Posted February 8, 2018 Share Posted February 8, 2018 I can think of a few rocks that it could be, but it is not quite right for any of them. Never seen slag like this before either. Does it have a streak? How heavy does it feel? How hard is it? Does it scratch with a nail, glass? Link to comment Share on other sites More sharing options...
doushantuo Posted February 8, 2018 Share Posted February 8, 2018 malachite with conchoidal fractures? Link to comment Share on other sites More sharing options...
PaleoRon Posted February 8, 2018 Share Posted February 8, 2018 Slag was my first impression as well. Link to comment Share on other sites More sharing options...
Ludwigia Posted February 8, 2018 Share Posted February 8, 2018 I've seen slag like this before so I'll have to agree. Greetings from the Lake of Constance. Roger http://www.steinkern.de/ Link to comment Share on other sites More sharing options...
Roberta NJ CA Posted February 8, 2018 Author Share Posted February 8, 2018 Thanks for everyone who responded. I'll try the scratch testing that you suggested ynot.... It seems the consensus is common "slag". I'll add this to my "concretions" crate which I'm officially naming "SLAG" - For some reason I find the sound of the word appropriate for such things! Link to comment Share on other sites More sharing options...
Malone Posted February 9, 2018 Share Posted February 9, 2018 I agree with slag. I believe it's olivine slag from steel production. There's a lot of it here in Pueblo aka steel city. Link to comment Share on other sites More sharing options...
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