(ভূতত্ত্ব

groundmass's Usage Examples:

The matrix or groundmass of a rock is the finer-grained mass of material in which larger grains, crystals or clasts are embedded.

fine-grained groundmass of non-visible crystals, as in a porphyritic basalt, or phanerites or intrusive rock, with individual crystals of the groundmass easily.

usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock.

felsic type such as felsites and rhyolites, may have a cryptocrystalline groundmass as distinguished from pure obsidian (felsic) or tachylyte (mafic), which.

basalts and by the presence of olivine and titanium-rich augite in its groundmass and phenocrysts, and nepheline in its CIPW norm.

dispersed in a fine-grained silicate rich, generally aphanitic matrix or groundmass.

through their fine-grained groundmass.

In many trachytes, however, the phenocrysts are few and small, and the groundmass comparatively coarse.

of crystal and rock fragments in a glass-shard groundmass, albeit the original texture of the groundmass might be obliterated due to high degrees of welding.

is a clast or mineral fragment in a metamorphic rock, surrounded by a groundmass of finer grained crystals.

crystals to their groundmass (Hall, 1996).

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

Igneous rocks with >90% amphiboles, which have a feldspar groundmass, may be a lamprophyre.

olivine and titanium-rich augite pyroxene with minor plagioclase set in a groundmass of augite and more sodic plagioclase and perhaps analcite and biotite.

augite) phenocrysts that are up to 5 mm in diameter set in a fine grained groundmass.

trachyandesite, composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass.

are commonly porphyritic, having large crystals embedded in the fine groundmass or matrix.

Phlogopite mica is a commonly known phenocryst and groundmass phase within ultrapotassic igneous rocks such as lamprophyre, kimberlite.

listvenite, listvanite, or listwaenite) is a rock type that forms when the groundmass of ultramafic rocks, most commonly mantle peridotites, is partially altered.

magnesian ilmenite, and phlogopite, in a fine- to medium-grained groundmass.

The groundmass mineralogy, which more closely resembles a true composition of.

it is often referred to as boulder clay) down to gravel and sand, in a groundmass of finely-divided clayey material sometimes called glacial flour.

bearing hydrothermal fluids, altering biotite or amphibole within the rock groundmass.

groundmass's Meaning':

(geology