petrosilex

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It's a recognised English word, but it isn't in the official NASPA Scrabble word list.

Definition of petrosilex

2 senses · 1 part of speech · etymology included

noun

felsite

“Petrosilex has given rise to different .”
“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.”
“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.”

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noun

felsite

“Petrosilex has given rise to different .”
“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.”
“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.”
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.

Definitions from Wiktionary, CC BY-SA.

From petro- + silex.

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