One outcropping of this rock type, known as he Leona formation, expands discontinuously for 21 miles in the Bay Area of California.  A group of small quarries of this rock type top Snaggy Ridge at the Carbaugh Run Quarry site in Adams County, Pennsylvania.  One light blue grey variety, called comendite, gets its color from small crystals of riebeckite and arfvedsonite.  A peralkaline variety called Pantellerite has higher iron and lower aluminum composition that makes it more mafic than comendite.  For 10 points, name this felsic rock, the extrusive equivalent of granite. 
One outcropping of this rock type, known as he Leona formation, expands discontinuously for 21 miles in the Bay Area of California.  A group of small quarries of this rock type top Snaggy Ridge at the Carbaugh Run Quarry site in Adams County, Pennsylvania.  One light blue grey variety, called comendite, gets its color from small crystals of riebeckite and arfvedsonite.  A peralkaline variety called Pantellerite has higher iron and lower aluminum composition that makes it more mafic than comendite.  For 10 points, name this felsic rock, the extrusive equivalent of granite. 
One outcropping of this rock type, known as he Leona formation, expands discontinuously for 21 miles in the Bay Area of California.  
{Rhyolite}