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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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<blockquote data-quote="user 4386" data-source="post: 652372" data-attributes="member: 4386"><p>If it is magnetic it is more probably pyrrhotite. You need to test its properties, photos are not sufficient,. Pyyrhotite tends to be more reddish-bronze than pyrite (which is more yellow), and this looks like pyrrhotite but photo colours are unreliable. The most diagnostic features are that pyrrhotite will pick up a steel sewing needle and pyrite will not, and the hardness of pyrite is 6 to 6.5 whereas pyrrhotite is 3.5 to 4 (very different), Usually a steel pocket-knife blade will easily scratch pyrrhotite but not pyrite (but it depends on the steel a bit as some steel may scratch pyrite). Same with most window glass.</p></blockquote><p></p>
[QUOTE="user 4386, post: 652372, member: 4386"] If it is magnetic it is more probably pyrrhotite. You need to test its properties, photos are not sufficient,. Pyyrhotite tends to be more reddish-bronze than pyrite (which is more yellow), and this looks like pyrrhotite but photo colours are unreliable. The most diagnostic features are that pyrrhotite will pick up a steel sewing needle and pyrite will not, and the hardness of pyrite is 6 to 6.5 whereas pyrrhotite is 3.5 to 4 (very different), Usually a steel pocket-knife blade will easily scratch pyrrhotite but not pyrite (but it depends on the steel a bit as some steel may scratch pyrite). Same with most window glass. [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
❓Your Mineral Identification Questions answered here
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