Exposing Falsehoods and Revealing Truths
This is exactly what the bedrock under the towers looked like before being melted: .... http://geology.about.com/od/more_metrocks/ig/metamorphics/NYCschist... .... After being melted , the rock looked like gray ice cream with a white
swirl. I would suspect the white swirl is melted mica and other quartz. I guess you would call it glass at that point.