A decent recommendation for what a matrixed crystal can be used for is to suggest that you can use it for both or all of what it contains metaphysically. And with Tourmalinated Quartz you can use the aspects of both the Black Tourmaline and the quartz. The Black Tourmaline is a fantastic protection stone and the Quartz, perfect for finding clarity in decision making. It is especially good for deflecting negative environmental influences. It can also offer knowledge and awareness of the world around you.