How To Use Groundmass In A Sentence
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In all specimens the groundmass is peppered with opaque minerals, rare apatite laths and rare euhedral blade-like calcite.
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Quartz in groundmass does not appear to have nucleated directly on phenocryst, but is in optical continuity with it. (f) Primary vapor-rich fluid inclusion in phenocrystic quartz.
Granophyre_photos.html
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The groundmass of these leucocratic segregations is heterogeneous, consisting of centimeter-scale regions dominated by nepheline, natrolite, alkali feldspar, or wollastonite.
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The maximum length of most microbes in Group II could not be measured accurately because they are tightly embedded in the silica groundmass.
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The groundmass consists mainly of bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite.
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The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass).
Of Books and the Sea
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The granite's granophyric groundmass consists of intergrown quartz and potassium feldspar (~Or45), the latter consisting of plumose splays that nucleated directly from pre-existing phenocrysts.
Granophyre.html
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The groundmass of these leucocratic segregations is heterogeneous, consisting of centimeter-scale regions dominated by nepheline, natrolite, alkali feldspar, or wollastonite.
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Pyroxene, quartz and augite form the groundmass, as seen in section.
The Long Labrador Trail
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Mineral and groundmass separates were loaded in 99.99% copper foil packets.
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The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass).
Of Books and the Sea
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Figure parts a-e with crossed nichols. (a) Micrographic groundmass surrounds feldspar phenocryst fragment. (b) Micrographic groundmass around clinopyroxene phenocryst.
Granophyre_photos.html
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The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet; zircon and apatite are conspicuous accessory minerals.
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The fine-grained ash groundmass contains equal proportions of scoriaceous tachylite and palagonite with basaltic lithic fragments.
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The rock here is a porphyritic granite (porhyritic meaning that the stone has large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass).
Of Books and the Sea
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Figure parts a-e with crossed nichols. (a) Micrographic groundmass surrounds feldspar phenocryst fragment. (b) Micrographic groundmass around clinopyroxene phenocryst.
Granophyre_photos.html
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The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite.
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Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
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Quartz in groundmass does not appear to have nucleated directly on phenocryst, but is in optical continuity with it. (f) Primary vapor-rich fluid inclusion in phenocrystic quartz.
Granophyre_photos.html
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Only in rare examples are there discontinuities in the silica groundmass around the microbes that may denote the outer limit of the silica that originally encrusted the microbe.
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Electron microprobe element maps show the distribution and quantity of alkali feldspar in the fine-grained groundmass of the altered basalts.
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Electron microprobe element maps show the distribution and quantity of alkali feldspar in the fine-grained groundmass of the altered basalts.
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Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
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Radiating fringe of feldspar in groundmass is in optical continuity with phenocryst, from which it nucleated. (e) Quartz phenocryst is surrounded by feldspar groundmass.
Granophyre_photos.html
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Electron microprobe element maps show the distribution and quantity of alkali feldspar in the fine-grained groundmass of the altered basalts.
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The microgranite has a felsitic groundmass containing microphenocrysts of albite and orthoclase along with phenocrysts of corroded quartz and sporadic dihedral garnet.
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Pyroxene mineralogy evolves along two paths with near end-member hedenbergite phenocrysts in the groundmass and aegirine solid solution in miaroles.
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Feldspar compositions in the groundmass are slightly more Or-rich than the phenocrystic feldspar, which ranges from An10Or15Ab75 to about An1Or44Ab55.
Granophyre.html
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The more altered dykes of the Black Coast have groundmasses of clinopyroxene, plagioclase and rare biotite.
