OldSalt Posted October 21, 2008 Share Posted October 21, 2008 Any one know what red colored non-magnetic rock (In AZ) would make a VLF sound off? I have crushed up a couple of specimens and found nothing in them. :headphones: I can put up some pics if needed. Quote Link to comment Share on other sites More sharing options...
Goldfinger Posted October 21, 2008 Share Posted October 21, 2008 The fact that it's red tells me it's probably an iron mineral. Could be hematite, limonite,goethite or many others. It could also be a combination. Here's a link where you enter all the characteristics to help you narrow the search. I've never had any of the ones listed above set off my detector so perhaps a unique composition is responsible. A good picture would be nice. http://www.mindat.org/advanced_search.php Steve Quote Link to comment Share on other sites More sharing options...
OldSalt Posted October 21, 2008 Author Share Posted October 21, 2008 The fact that it's red tells me it's probably an iron mineral. Could be hematite, limonite,goethite or many others. It could also be a combination. Here's a link where you enter all the characteristics to help you narrow the search. I've never had any of the ones listed above set off my detector so perhaps a unique composition is responsible. A good picture would be nice. http://www.mindat.org/advanced_search.php Steve Thanks Goldfinger, it does look like Red Hematite. My detector is set at 300 khz and it sounded off as positive for gold. A different signal is given for black sand. Quote Link to comment Share on other sites More sharing options...
fredmason Posted October 21, 2008 Share Posted October 21, 2008 there are several types of hot rocks including the red ones around Yuma/pot holes area...that will cause that signal, the good news is they are usually on the surface and you can see them and give them a kick without fear of kicking a specie away. Fred Quote Link to comment Share on other sites More sharing options...
Paleface Posted October 22, 2008 Share Posted October 22, 2008 Any one know what red colored non-magnetic rock (In AZ) would make a VLF sound off? I have crushed up a couple of specimens and found nothing in them. :headphones: I can put up some pics if needed. We also have some non-magnetic to highly magnetic Basaltic cinders that get their color from oxidised iron rich minerals. They are abundant around lava flows and cinder cones. Part of the Franconia meteorite strewn field is a hot rock hell due to these cinders. Some of them are totally non-magnetic, an yet they make a VLF scream. A streak test will probably tell you if your rock is Hematite or not. http://en.wikipedia.org/wiki/Hematite Jim Quote Link to comment Share on other sites More sharing options...
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