1. 
   Quartz Porphyry
   Quartz porphyry is a widely distributed intrusive igneous rock formed from magma in small (relatively speaking, an area of 5000 square kilometres is 'small' in geological terms) intrusive structures, such as dikes and sills, which were usually formed at no great depth. It is generally light coloured...
   Found op http://www.probertencyclopaedia.com/browse/HQ.HTM
   
   
2. 
   Quartz-porphyry
   Quartz-porphyry, in petrology, is the name given to a group of hemi-crystalline acid rocks containing porphyritic crystals of quartz in a fine-grained matrix, usually of micro-crystalline or felsitic structure. In specimens, the quartz appears as small rounded, clear, greyish, vitreous blebs, which...
   Found op http://en.wikipedia.org/wiki/Quartz-porphyry
   
   

Tip: double click on a word to show its meaning.