Gem zircon and sapphire age dating and application of origin determination: A study from New England sapphire fields, New South Wales, Australia

Most of the spinels are found in shades of red to purple. Colourless, green and cobalt bearing varie

Noble gases —elements of the last column of the periodic table—are chemically defined by their f

Jade or "Fei Cui" are trade names for a stone that typi- cally contains only one or more main minera