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Magnetite vs Hercynite

Posted by Utilisateur anonyme  
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Utilisateur anonyme July 19, 2012 09:52PM
Hello
How to differencier visually Magnétite and Hercynite ?
Thank

jean pierre
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Donald Peck July 20, 2012 05:41PM
Hello Jean Pierre,

Is the mineral octahedral or rounded grains (or massive). Hercynite is usually rounded grains or massive, not euhedral crystals (not to say it never is octahedral). It is usually green or greenish black, unlike black magnetite. But the best test is magnetic. Hercynite is not attracted to a magnet while magnetite is strongly attracted.

I am assuming you have small grains or crystals in a micro sized vug. If you insert a small cylindrical magnet in the end of plastic drinking straw, find its balance point and pass a needle through the midline of the straw at that point, you can balance it on a support made from cardstock (or any nonmagnetic material). It helps to cut a one centimetre length of drinking straw, slit it along its length and slide it onto the longer straw. You can move it as a counter poise to finely balance the assembly. Even a single micro crystal when brought up beneath the magnet will cause the straw to move.
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Utilisateur anonyme July 20, 2012 07:05PM
The minérals are in a matrix (In den Dellen ,Deutchland),and are arounded and the color is dark browny ;
I go taking a cristal ,and make your shrewdness;

thank Donald

jean pierre,
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Guenter Blass July 20, 2012 09:04PM
You can visually differentiate them,
Magnetite is metallic and shiny, shiny glaze is hercynite.
2) On the rocks or paragenesis, hercynite is most often associated with crystalline schists with corundum or cordierite.
The best method is an EDS analysis.

Günter Blaß
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Utilisateur anonyme July 22, 2012 01:25PM
After testing the good idéa of Donald ,the résultat is...Magnétite!

Thank

jean pierre
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