Black Amethyst : 
Origin ; Brazil . 
Black Amethyst is Amethyst that is heavily included with Hematite that it appears black with tints of violet. The red that appears on some of these Amethysts is from the Hematite. You'll also notice a Smoky Quartz appearance on some of these crystals. When you hold the crystal over a flashlight you typically cannot even see through the crystals, most of them are that dark. Some of them will have a slight glow of a deep purple.