GRANITE COLORS: Our Columbaria are readily available in two colors, Interglo Grey and Deep Gray. By special order all Columbaria can be produced in any of our granite colors, additional charges may apply.
WHY GRANITES ARE DIFFERENT
Pure white granite is relatively rare and in high demand. Much of the highest quality white granite is mined in Vermont, according to the University of Vermont. White or light gray granite is formed when a large amount of large quartz crystals is embedded inside of feldspar. These quartz crystals must be relatively pure in their mineral content to create such a light color. Minerals that create darker grays or reddish tints are not found in these veins of granite, which helps to create the granite's much lighter color.
Granite slabs featuring high concentrations of the minerals hornblende or mica will be some shade of gray, according to Indiana State University. Minerals that produce reddish coloration in granite may also be present, but if these dark minerals are higher in concentration, then the overall color will be light to dark gray. Veins with very little mica or hornblende may stay a light shade that is nearly white. Dark gray granite may feature a smooth, fine-grained pattern or show large chunks of lighter-colored quartz that form a busy pattern when cut.
While other stone materials like sandstone and limestone come in pink varieties as well, the strength of pink granite and its resistance to absorbing moisture makes it very versatile, says the University of Minnesota. Pink or reddish coloration in stones like granite is caused by the mineral feldspar. Lighter shades of pink granite are created by an absence of dark minerals like mica and a higher amount of quartz, which remain white or translucent even when trapped in a pink feldspar matrix. Slabs of reddish granite are as strong as any other color, making them a good choice for unusual counter tops or flagstones.
Pure black granite is uncommon but available, although mottled patterns featuring black and gray or pink intermixed are more common. Black granites that do not feature other colors are not true granites, according to Rutgers University, because they contain different minerals. However, the quartz crystal structure remains the same in black granite so there is no reduction in strength or durability. Black minerals like basalt, diabase and gabbro are found in the darkest granites but are not present in other forms of granite.