Black Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins. Tourmaline is classified as a semiprecious stone and occurs in...
With the possible exception of the horizon meeting the bright blue sky on a perfect summer day, or a sandy beach blending into a tropical bay, there may not be...
Rhyolite is a volcanic, igneous rock with high silica content. Its name is taken from the Greek word “rhyax,” meaning “a stream of lava.” It is chemically identical to Granite,...