0 0 More by Harrison W. Lindsley This article was originally published with the title “Brown and Red Sandstone, of Connecticut” in SA Builders Vol. 8 No. 5build (November 1889), p. 86 ...

Granite also contains mica and amphibole minerals – “a group of generally dark colored minerals often containing ions or magnesium that can be green, black, white, yellow, blue or brown.” ...