Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.
22.
Sometimes granular augite or spongy riebeckite occurs in the groundmass, but as a rule this part of the rock is highly feldspathic.
23.
Ore is a highly strained massive to matrix olivine-sulfide adcumulate with a fine pyrrhotite-pyrite groundmass and prominent pentlandite porphyroblasts.
24.
Sedimentary breccia consists of angular, poorly sorted, immature fragments of rocks in a finer grained groundmass which are produced by mass wasting.
25.
Typical examples of metamorphic rocks include porphyroblastic schists where large, oblate minerals form an alignment either due to growth or rotation in the groundmass.
26.
A "'radiolarian chert "'is well-bedded, microcrystalline radiolarite that has a well-developed siliceous cement or groundmass.
27.
Additional minerals are : apatite, ilmenite, magnetite, olivine, orthopyroxene, phyrrotite, quartz, rhyolite in the groundmass, and spinel in inclusions.
28.
Such phenocrysts, usually quartz or feldspar, make up 20 %-40 % of the rock, and are embedded in a groundmass of similar composition.
29.
One way to infer the composition of the magma that created the cumulate rocks is to measure groundmass chemistry, but that chemistry is problematic or impossible to sample.
30.
The rock consists of microphenocrysts of olivine altered to serpentine, pinkish brown titanaugite, brown kaersutite amphibole, and about 15 % magnetite, embedded in a colourless analcime groundmass.
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