ग्राउंडमास इसके अंग्रेजी अर्थ का उदाहरण

The brown, fine-grained groundmass consists of very small quartz, feldspar, and biotite mica crystals.

porphyritic: containing phenocrysts in a fine groundmass.

When a rock cools too quickly the liquid freezes into a solid glass, or crystalline groundmass.

Typical examples of metamorphic rocks include porphyroblastic schists where large, oblate minerals form an alignment either due to growth or rotation in the groundmass.

Cumulates are named according to their dominant mineralogy and the percentage of crystals to their groundmass (Hall, 1996).

Adcumulates are rocks containing ~100–93% accumulated magmatic crystals in a fine-grained groundmass.

Mesocumulates are rocks with between 93 and 85% accumulated minerals in a groundmass.

Orthocumulates are rocks containing between 85 and 75% accumulated minerals in groundmass.

A layer with 50% plagioclase, 40% pyroxene, 5% olivine and 5% groundmass (in essence a gabbro) would be termed a plagioclase-pyroxene Adcumulate with accessory olivine.

A rock consisting of 80% olivine, 5% magnetite and 15% groundmass is an olivine mesocumulate, (in essence a peridotite).

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.

The foremost problem is that in large ultramafic intrusions, assimilation of wall rocks tends to alter the chemistry of the melt as time progresses, so measuring groundmass compositions may fall short.