Chiastolite 16mm Round - 15-16 Inch Blue Porcelain Agate Black Tourmaline is a black

Black Tourmaline is a black crystalline aluminum borosilicate mineral with occasional light gray inclusions that appear as flecks or veins

Hematite is black to steel to gray or silver to gray

red and brown

or some degree of pink in between

It's defined by a bright green color

Chiastolite 16mm Round - 15-16 Inch Blue Porcelain Agate Black Tourmaline is a blackChiastolite is also known as the Cross Stone for the cross matrices of browns, blacks, tans and golden tones that occur naturally within the stone. A variety of Andalusite, it is believed to bestow strength, power and perseverance and is also considered a calming and protective stone.