Examples of pyroxene

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Note the presence of a cummingtonite with a pyroxene-like shape.
The lower two-thirds of the unit is a medium-grained, lithic, crystal tuff, now largely altered to zeolites but with relict pyroxene and feldspar crystals recognizable.
The two pyroxenes form discrete crystals as well as lamellar, drop-like or more irregular intergrowths with each other.
The volcaniclastic siltstone is composed of crystals (olivine, pyroxene, quartz), glass (globules and irregularly shaped shards) and rock fragments.
Other samples have glomerocrystic aggregates of plagioclase and pyroxene.
The magnetic fraction of the surface sand contains pyroxene and feldspar grains as in the bulk material, but little quartz.
It is generally well banded on a millimetre to centimetre scale as defined by the variation from plagioclase to pyroxene-garnet-rich layers.
Unweathered basalt minerals such as olivine and pyroxene contain high amounts of reduced iron that microbes can scavenge.
Layering is characterized by dark layers containing high proportions of olivine and pyroxene alternating with light layers containing high proportions of plagioclase.
However, pyroxene is commonly entirely altered and some tabular pseudomorphs indicate that orthopyroxene was also present.
The gabbros and microgabbros include pyroxene (20-30 %), olivine (4-10 %), and biotite (1-4 %).
Crystallization was moderately advanced (c. 20 %) with the precipitation of plagioclase, pyroxene and oxide placing the magma below its liquidus temperature.
The groundmass consists of plagioclase, pyroxene and glass with an interstitial texture.
A succession of mineral reactions is shown by inclusions in and overgrowths on garnet, pyroxenes and amphiboles.
This is a particular problem for clay minerals in ground mixtures because they are more fragile than some other minerals such as quartz and pyroxene.

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