The type of olive is a Kalamata olive, a large black (dark purple) olive from Greece.

Black?

Black olives are actually green olives that are ripe. There are many types of olives and many of them are already dark in color. But the basic green olive (neé spanish olive or manzinilla olive) ripen over time into black olives ;)

Black and yellow will make olive green. Be careful of adding too much black though. Just a little black goes a long way to giving you a beautiful shade of olive. You can adjust the depth of the olive green by the use (more or less) of black.

Yes, black olives are grown on olive trees. The black and green olive comes off the same tree. It is when they are picked and processed that makes them black or green. One of the biggest olive tree areas in the states is in CA and southern Italy in the world.