halitedigger
starting to spend too much on rocks
Lost in the Mojave, Sierras or Itoigawa
Member since September 2013
Posts: 104
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Post by halitedigger on Jun 22, 2019 13:24:36 GMT -5
I recently purchased a bunch of interesting magnetite specimens from a fellow club member here in California. She told me she had collected these years ago from one of the mines in Iron County, Utah and that the actual location was about a 10' x 10' section of the larger mine. While I was never a fan of magnetite when I saw these crystals I couldn't help but to buy a bunch of them. I was under the impression they are quite rare and 1dave confirmed that for me. If anyone has any more information on these I would love to hear from you. Having said that, let's get on with the show! The lager specimen is over 4" and was the second largest one she had. These octahedrons, or dodecagons? are what really grabbed my attention. Some have twins. And some do this, stack up on one another forming these kind of towers with siderite and apatite crystals attached. I have several of the crystals left, but they are all in my shop over in Japan. I was wondering if anyone else has any of these or has come across them? Cheers! PS, I am looking for agates and other rare minerals from the US. I am a dealer in Japan and sell them there. Likewise I bring back rare Japanese minerals and sell them here in my Etsy shop.
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Post by pauls on Jun 22, 2019 16:46:34 GMT -5
Nice specimens.
"Martite" a name given to Hematite shapes after Magnetite is quite common at Mud Tank in the Harts Ranges in Central Australia. Basically the same crystal shapes just no longer Magnetite.
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halitedigger
starting to spend too much on rocks
Lost in the Mojave, Sierras or Itoigawa
Member since September 2013
Posts: 104
|
Post by halitedigger on Jun 22, 2019 20:18:13 GMT -5
Nice specimens. "Martite" a name given to Hematite shapes after Magnetite is quite common at Mud Tank in the Harts Ranges in Central Australia. Basically the same crystal shapes just no longer Magnetite. Paul, Thank you for the comment. I have some martite with green apatite from Mexico and I never thought to question if these are martite, just trusting the seller's information. I know the octahedrons are magnetic, but I didn't bother to test the big specimen. Checking Mindat did show that martite is from the mines. I will have to check them when I get back to Japan. Have you seen the octahedrons with the repeating triangular lines in Australia? Thanks agin!
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Post by pauls on Jun 22, 2019 23:45:46 GMT -5
The ones I have collected are just straight sided variations of 3 sided pyramids, most have cleaved off so they don't have a pyramid point. I Just checked, they are attracted quite strongly to a strong magnet, they are also very weakly magnetic, can slightly move a pin.
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Post by 1dave on Jun 23, 2019 10:34:09 GMT -5
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