Black Moss Opal
Black Moss Opal, from Australia, is a milky-white to brownish colour with dark greenish moss-like inclusions. Moss opal is also known as Dendritic Opal, for the tree-like shape of the inclusions. Sadly – it has none of the spectacular play of color that one might hope for from an opal from Australia, which makes it common opal, but is still a handsome stone for all of that. Opal is defined as an amorphous mineraloid comprised of hydrated silicon dioxide – aren't you glad you asked!