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Magnetite is an iron oxide. Its most unusual feature is that it is strongly magnetic. It was
discovered by the ancient Greeks and was used to make compasses. It
has a black or dark grey streak.
Dave Freeman writes:
This is a 14 pound stream worn magnetite
cobble from very near the old US Steel mine at Atlantic City, Wyoming
(south pass end of the Wind River Mountains. 2.87 billion years old,
and roughly 40% iron. My gold prospector associate found it with his
metal detector. A good magnet really likes it, but the real test, it
streaks GRAY as magnetite.
It has the former described "melted material
with holes" and pockets even! I sliced and polished a back side corner
on the specimen and magnetite has a crystalline structure ( this one has
that SIMULATES the Widmanstatten figures..to an idiot anyway). For lack
of a better word, "globs" of iron rich/iron poor (darker gray, lighter
more shiny gray) in a scattered arrangement.
I purchased this magnificent meteorwrong for $15. I find it is an
excellent specimen of magnetite, and one heck of a trophy meteorwrong!
Best wishes and best meteorwrongs,
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