petrosilex

English

Etymology

From petro- +‎ silex.

Noun

petrosilex (plural petrosilexes)

1. (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.

2. (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.

Anagrams

• exploiters, sexploiter