petrosilex
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English
[edit]Etymology
[edit]Noun
[edit]petrosilex (plural petrosilexes)
- (mineralogy) felsite
- 1871, Thomas Egleston, Catalogue of Minerals, with Their Formulae and Crystalline Systems:
- Petrosilex has given rise to different .
- 1884, Harvard University. Museum of Comparative Zoology, Bulletin: Geological series - Volume 1, page 399:
- The name simple petrosilex seems to have been confined to the more apparenttly homogeneous felsites, while the term porphyritic petrosilex was given to those rocks supposed to have a base of simple petrosilex or of felsparoid which held enclosed porphyritic crystals.
- 1896, Arthur Winslow, Charles Doolittle Walcott, Florence Bascom, Contributions to the Cretaceous Paleontology of the Pacific:
- A brief history of the word felsite and its synonyms in different countries (petrosilex, eurite, and ha:lleflinta) will serve to illustrate the unfitness of it and these allied terms for exact petrographical usage.
- (mineralogy) A fine-grained, silica-rich rock composed of quartz and sometimes other minerals, similar to the chemical structure of hornstone but having a different texture.