	The Language of Geology - Dictionary and Research Guide		Provided by

porphyry

Porphyry is a very hard igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass. The larger crystals are called phenocrysts.

Wikipedia and Wikis

Porphyry (geology) - Wikipedia
http://en.wikipedia.org/wiki/Porphyry_(geology)

Other

Flash showing rhomb porphyry formation
http://www.ig.uit.no/geostudiesamling/
Mons Porphyrites quarries, Egypt
http://www.arch.soton.ac.uk/Projects/projects.asp? ...
A visit to the ancient Imperial Porphyry quarries in Egypt.
http://www.saudiaramcoworld.com/issue/199806/via.p ...
Rhomb porphyry lavas
http://www.toyen.uio.no/geomus/nettutstillinger/Os ...
Roman occupation of the Eastern Desert of Egypt and the Imperial Porphyry quarries.
http://weekly.ahram.org.eg/1999/417/special.htm

Keywords and Synonyms

porphyry, Porphyritic, Rhomb porphyry, Rhomb porphyr, Porphyric, Porphyries, Igneous rock porphyry

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