from your http://www.ventifact.com/about.html link:

"...Wind carrying suspended particles like sand can polish and smooth a wide variety of rock types but Long Island Pleistocene ventifacts are mostly formed in fine quartzite and occasionally coarse quartzite (E.A.) , granitic rock and quartz pebbles."

Now there's a fine phrase for you: "coarse quartzite." Try saying _that_ three times quickly!