As said above, granite must be at least 20% quartz, which means an all black rock is not a granite. Most commonly, black granite is in fact gabbro, ... Red Granite. Red granite (Credit: eurasian.com) ...

As NASA’s MAVEN mission heads toward Mars, scientists say they’ve discovered highly unusual, light-colored rock on the mostly dark-toned Red Planet – and two teams have dueling ideas of what ...

Granite is primarily composed of quartz and feldspar with small amounts of mica, and other minerals. This variable composition is what gives granite its different hues of pink, red, gray and white.

Granite is the state rock of New Hampshire and the state "building and monument stone" for Massachusetts ... This variable composition is what gives granite its different hues of pink, red, ...

Treasure hunting for white quartz, red granite Rocks lend color, texture and a touch of Zen to your garden. Bill Steer · CBC News · Posted: Aug 21, 2014 7:00 AM EDT | Last Updated: August 21, 2014 ...