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Gold Prospecting
Metal Detecting for Gold
What's Magnetic, But Not Picked Up By A Metal Detector?
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<blockquote data-quote="XLOOX" data-source="post: 643399" data-attributes="member: 16174"><p>Just to do your head in, there are a STACK of minerals that will stick to a magnet, of which magnetite is just the most common, followed by maghemite. Most contain iron.</p><p></p><p> Maghemite is often brown but can be grey black like magnetite. It is pretty easy to tell the diff though even if both rocks are grey/black - if you scrape the rock on something harder - like a file or hard sharpening stone, the magnetite will streak grey and the maghemite will streak brown.</p><p></p><p> ANY of the 8 minerals in the list with "Ferrimagnetic" in the 3rd column will stick to a strong rare earth magnet but most bits you find wont be detected by a PI detector, it depends on the size, structure and alignment of the microscopic crystal magnety bits in an individual piece.</p></blockquote><p></p>
[QUOTE="XLOOX, post: 643399, member: 16174"] Just to do your head in, there are a STACK of minerals that will stick to a magnet, of which magnetite is just the most common, followed by maghemite. Most contain iron. Maghemite is often brown but can be grey black like magnetite. It is pretty easy to tell the diff though even if both rocks are grey/black - if you scrape the rock on something harder - like a file or hard sharpening stone, the magnetite will streak grey and the maghemite will streak brown. ANY of the 8 minerals in the list with "Ferrimagnetic" in the 3rd column will stick to a strong rare earth magnet but most bits you find wont be detected by a PI detector, it depends on the size, structure and alignment of the microscopic crystal magnety bits in an individual piece. [/QUOTE]
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Gold Prospecting
Metal Detecting for Gold
What's Magnetic, But Not Picked Up By A Metal Detector?
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