| Abstrakt: |
The silicate mineral olivine concentrates nickel out of a magma (Cawthorn [3]). The bright yellow mineral is chalcopyrite, the off-white (bulk of the sample) is pyrrhotite, the brown (top left) is oxidized pyrrhotite, and the gray matrix is microgabbro. During the slow cooling of large intrusions, minerals form in the predetermined order of olivine, plagioclase, hypersthene, and clinopyroxene, and they sink in that same order to form layers of rock with different mineral assemblages. The dull yellow mineral is pyrrhotite, and the bright yellow mineral is chalcopyrite. [Extracted from the article] |
