kac Posted December 9, 2021 Share Posted December 9, 2021 It is fairly heavy for it's size, I'll try to figure out the density. Magnets are attracted to it and I can see a couple sparkles of some crystalization but haven't cut it open as I need to get a diamond blade for my tile saw. 1 Link to comment Share on other sites More sharing options...
Hardtimehermit Posted December 9, 2021 Share Posted December 9, 2021 Looks like magnetite, try a streak test and see if it is black, if so probably magnetite. 2 1 Link to comment Share on other sites More sharing options...
Valens Legacy Posted December 9, 2021 Share Posted December 9, 2021 Nice looking rock and it could magnetite or granite. How big is it, or better yet do you have a picture of the whole rock. The bottom picture looks like the backside of a axe from some of the Indians from Maine. 1 Link to comment Share on other sites More sharing options...
Steve Herschbach Posted December 9, 2021 Share Posted December 9, 2021 Magnet attested to it screams magnetite, or a rock with very high magnetite content. I have a few large doorstops of pure magnetite, and they attract a magnet as if the were steel plate. If yours is less magnetic, it could be a high magnetite content basalt rock, or an ultramafic rock with high magnetite content. 3 Link to comment Share on other sites More sharing options...
nebulanoodle Posted December 9, 2021 Share Posted December 9, 2021 Breaking it with a hammer v. slicing it can give you some good ID clues too. Link to comment Share on other sites More sharing options...
kac Posted December 9, 2021 Author Share Posted December 9, 2021 Black streak. Weight was 266g, displaced 100ml. Link to comment Share on other sites More sharing options...
GB_Amateur Posted December 9, 2021 Share Posted December 9, 2021 So specific gravity is 2.66? With measurement uncertainties taken into account this measurement alone is consistent with, what, 75% of all rocks? (Just my WAG...) Definitely not pure magnetite, though (s.g. = 5.17). The mystery continues.... I'm curious what kind of a signal (if any) your Garrett Sea Hunter (PI, right?) gives. Link to comment Share on other sites More sharing options...
kac Posted December 9, 2021 Author Share Posted December 9, 2021 Found with the Tejon. I run my sensitivity really high so it will pick up on some rocks and tiny coal etc. You should be able to do the same with your Vaquero, just crank it up and back it off till the chatter just stops. It will find the tiniest targets that way, good for earings etc in tot lots. 2 Link to comment Share on other sites More sharing options...
Rick N. MI Posted December 10, 2021 Share Posted December 10, 2021 I find a lot of rocks like that in northern Michigan. My detectors hit them all and they're magnetic too. I have kept them all. Upper peninsula of Michigan mines a lot of iron and copper. 1 Link to comment Share on other sites More sharing options...
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