Xavier,
Hematite is NOT attracted by a magnet. And it very often shows a smooth
dark red-brown to quasi black surface, often rounded when it is not in
(black shiny) crystals . Rarely is the rounded surface rough.
If metallic grains are visible, just follow Bernd's suggestion and make a
window.
Hi again,
Yes I will probably try to slice it but I still wonder how :) I was planning to
just break it but if there's a doubt I'd prefer not :)
It's true that I forgot to say that it is clearly attracted to magnet and as the
micro picture shows there are (top of the picture) some brigh metalic
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