Virtualy all the ferro-magnesium silicates (pyroxenes, amphiboles etc)
are by definition iron bearing. I don't think they are magneticlly
attractive. Magnetite, usually in very small grains, can occur in
them. Alteration by water can produce hematite which can be
magnetically attractive and usually is. I just observed a sample where
a film of hemitite was less than a half milimeter thick and it made my
magnetic wand jump to it as if it were iron plate.
Elton
[EMAIL PROTECTED] wrote:
Bill,
I'm sure the mineral magnetite is your source of paramagmatism. Igneous rocks are
often magnetite rich.
Iron would also be in many other minerals...but magnetite is likely your source of
attracting a magnet(paramagnetism).
JD
Hi all,
I understand that mafic igneous rocks contain iron but does anyone know what
form it's in and how it's distribution is characterized? Is this iron content
high enough to make it magnetically attractive? I have a batch of interesting
wrongs that I'm trying to sort out.
Best regards,Bill
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