The compact, finer-grained material in which the crystals are embedded in a porphyritic rock.
〔地质〕基质（紧实的颗粒状物质，其中的晶体镶嵌在斑岩中）
Example sentencesExamples
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.
Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite.
In all specimens the groundmass is peppered with opaque minerals, rare apatite laths and rare euhedral blade-like calcite.
The maximum length of most microbes in Group II could not be measured accurately because they are tightly embedded in the silica groundmass.
Definition of groundmass in US English:
groundmass
nounˈɡroundˌmasˈɡraʊndˌmæs
Geology
The compact, finer-grained material in which the crystals are embedded in a porphyritic rock.
〔地质〕基质（紧实的颗粒状物质，其中的晶体镶嵌在斑岩中）
Example sentencesExamples
Orthoclase occurred as remnant phenocrysts in a groundmass of chloritic material resulting from alteration of iron-rich felsite cobbles.
In all specimens the groundmass is peppered with opaque minerals, rare apatite laths and rare euhedral blade-like calcite.
The wall rock was highly altered and consisted of a groundmass of pyrophyllite and fine-grained pyrite.
The maximum length of most microbes in Group II could not be measured accurately because they are tightly embedded in the silica groundmass.
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.