groundmass in English

noun
1
the compact, finer-grained material in which the crystals are embedded in a porphyritic rock.
Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.

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Below are sample sentences containing the word "groundmass" from the English Dictionary. We can refer to these sentence patterns for sentences in case of finding sample sentences with the word "groundmass", or refer to the context using the word "groundmass" in the English Dictionary.

1. The groundmass contains interstitial quartz or tridymite or cristobalite.

2. Both vitrain and fusain layers or bands are embedded in the Attritus, which is the coal matrix or groundmass

3. Minerals such as alkali feldspar, leucite, nepheline, sodalite, phlogopite mica, and apatite may be present in the groundmass.

4. The groundmass is Andesinite, hornblende, biotite, quartz and K-feldspar, whereas accessory minerals consist of magmetite, apatite, sphene and zircon

5. Alkali feldspar, apatite, clinopyroxene, olivine, magnetite, mica, nepheline, oxides, plagioclase, quartz, sodalite, titanite and zircon also form the groundmass of microliths in erupted rocks.

6. 18 Electron microprobe element maps show the distribution and quantity of alkali feldspar in the fine-grained groundmass of the altered basalts.

7. ‘The groundmass consists mainly of Bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite.’ ‘The highly soluble and aluminous Bytownite favored the …

8. The dacitic rocks associated with the porphyry copper-gold mineralization have porphyritic textures with phenocrysts of alkali feldspar, plagioclase, biotite, and very rare amphibole in a fine-grained feldspathic groundmass.

9. These heterogeneous lavas exhibit two distinct components: (1) an acid one, making up the light-coloured groundmass (fluidal rhyolite), and (2) a basic, dark, vitreous component in the shape of micro-pillows and/or flame-like patches.

10. One postshield vent erupted alkalic lavas (K2O 1.1–1.6 wt.%) with resorbed olivines of wide compositional range (cores, Fo86–71), resorbed Na-plagioclase (An57–30; largely andesine) and clinopyroxene (evolved; Mg#s 76–71), and groundmass orthopyroxene (Mg# ≤62).

11. In rock samples of a Middle Devonian spilitized basaltic sill near Langelsheim (Northwestern Harz Mountains) the following mineral assemblage: pumpellyite + prehnite + epidote + actinolite grown in a groundmass of albite, chlorite, calcite and quartz has been studied by use of a microprobe.

12. Up to 10% cash back  · An Augitite is an undersaturated porphyritic volcanic rock consisting of phenocrysts of augite and iron ore, with or without biotite or hornblende, in a brown glassy (usually Na-rich) groundmass

13. ‘The groundmass consists mainly of Bytownite with large grains of diopside and of colourless olivine, and small octahedrons of magnetite.’ ‘The highly soluble and aluminous Bytownite favored the formation of allophane.’ ‘I received a specimen of Bytownite today in the mail.’

14. The massive kimberlite contains phenocrysts of olivine (Fo90–Fo93), chrome-pyrope (7–12 mol.% uvarovite), and phlogopite together with xenocrysts of pyrope-almandine (28–36 mol.% pyrope, 58–64 mol.% almandine) set in a groundmass of olivine (Fo89.5), magnetite, perovskite, and serpentine.