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fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye

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It has been calibrated for the analysis of aphanitic lithic artifacts with 20 international geological certified reference materials (CRMs) containing well-established element concentrations (provided by the United States Geological Survey, Geological Survey of Japan, Institute of Geophysical and Geochemical Exploration, Canadian Certified Reference Materials Project, National Institutes of Science and Technology).
Columnar jointed basalt is a type of joint rock mass formed by the combined cutting effect of original joints and aphanitic microcracks, of which the original joint is a type of geological structure generated during the magmatic condensation process.
Microstructure of aphanitic clay is less sericitizated and is obviously orientational.
aphanitic igneous and silicified rock), and low quality raw material (e.g.
The Baltinava Formation, a well-defined interval in southeastern Latvian sections, comprises brownish-grey or grey limestone with seminodular to nodular structure and biodetrital or micritic (aphanitic) interlayers.
Two small exposures of atypical, grayish green, aphanitic skarn that host splotches of pink rhodonite, massive epidote and an unknown brown mineral have been exposed at the lowest peripheries of both the middle and lower workings (see under Rhodonite).
The chilled margin facies includes dark-grey coloured aphanitic rocks with common vesicle-rich levels (Fig.
The texture of the rock is porphyritic aphanitic with phenocrysts surrounded by microcrystalline matrix made of microlites of euhedral plagioclase grains.
4h) is medium grey, and has hornblende phenocrysts ranging from 3 to 5 mm in size in an aphanitic groundmass.
The rhyolite occurs as aphanitic to porphyritic flows and ignimbritic tuffs with flow banding and microporphyritic to porphyritic textures (Fig.
In the limits of the shoal, especially in its middle part where Vasalemma is located, the micritic-peloidal (aphanitic) limestones of the Paaskula Member form a comparatively homogeneous 4-7 m thick unit.
The sample consists of light grey, sparsely porphyritic, aphanitic rhyolite with potassium feldspar, and lesser amounts of quartz and granophyre phenocrysts.
At Ain Khuff, the Khuff formation is 562 feet thick, with alternating lithology from top to bottom being as follows: (1) a 92.5-foot thick aphanitic layer of calcarenitic limestone, commonly marly and fossilifer-ous; (2) a 233-foot thick aphanitic limestone; and (3) a 110.5-foot thick layer of dolomite and shale, with angular granitic sand and fine conglomerate at the bottom.