In some cases, felsic volcanic rocks may contain phenocrysts of mafic minerals, usually hornblende, pyroxene or a feldspar mineral, and may need to be named after their phenocryst mineral, such as'hornblende-bearing felsite '.
12.
Cryptocrystalline or amorphous stone such as chert, flint, obsidian, and chalcedony, as well as other fine-grained stone material, such as rhyolite, felsite, and quartzite, were used as a source material for producing stone tools.
13.
In Seokjang-ri and in other riverine sites, stone tools were found with definite traces of Palaeolithic tradition, made of fine-grain rocks such as quartzite, porphyry, obsidian, chert, and felsite manifest Acheulian, Mousteroid, and Levalloisian characteristics.
14.
Only the young Mount Wrangell still shows its shield-like form; the other, commonly older volcanoes have had much of their original form removed by glacial and other erosional processes, such as Rabbit Mountain and Felsite Peak, which are now eroded to form an outcrop.
15.
They can contain a very great variety of minerals, the principal ones being quartz, orthoclase and plagioclase feldspars, calcite, iron oxides and graphitic, carbonaceous matters, together with ( in the coarser kinds ) fragments of such rocks as felsite, chert, slate, gneiss, various schists, and quartzite.
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