Examples of olivine

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Octahedral cation ordering in olivine at high temperature.
No olivine was identified in the groundmass or as a phenocryst phase.
The zoning of the olivines is mostly reverse.
In thin section, however, only plagioclase and olivine clearly have cumulus status.
In this case, the olivine may represent xenocrysts that were collected from a relatively primitive cumulate sequence in an underlying chamber.
However, these melts did contain phlogopite, as well as olivine and/or clinopyroxene, as a part of their liquidus assemblage.
The volcaniclastic siltstone is composed of crystals (olivine, pyroxene, quartz), glass (globules and irregularly shaped shards) and rock fragments.
At this stage, for each three moles of ferrous iron supplied by olivine, one mole of hydrogen forms.
Figure 3 shows part of a barred olivine chondrule, where grains of olivine are set in a feldspathic groundmass.
Note the sharp but irregular contacts between the darker wehrlites and the lighter layered olivine oxide gabbros.
Therefore, on the basis of olivine composition, the marginal gabbro is a possible parental magma.
The oikocrysts become larger (4-5 cm) in the central olivine gabbros compared to marginal gabbros (0.5-2 cm) and are commonly optically zoned.
An exception to this is rare layering observed in the olivine glomerocrystic gabbro, where layering may dip either inwards or outwards.
Compared to olivine, augite has a greater degree of chemical zoning within individual grains and samples.

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