re: Ann: New Nickel Sulphide Discovery at Fis... dragonfly wrote
"Magmatic is intrusive meaning the magma hasn't broke through earth's surface"
Can it not be extrusive as well i?
Magmatic effusive rocks (basalt and rhyolite) have all be thrown out of volcanoes .Pumice is also the same just more gas bubbles in it.
Ann: New Nickel Sulphide Discovery at Fisher East, page-15
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