A preferred material from the Spanish Diggings quarries on the northern part of the Haertvill UpliftWyoming was a fine grained orthoquartzite that came in a spectrum of common colors, grays, yellows, browns, reddish tones and a variety that ranges from purple to lavender. In the sunlight the fine grained material can look like it has grains of sparkling sugar in it.
Information and photo courtesy of 11KBP
Information and photo courtesy of 11KBP