We found this very informative and helpful in spirit protection!
(Not written by Cal~Para; see below)

Black Tourmaline, One of the Must Have Crystals

The must have crystals always recommend for everyone to have are: Citrine for light and abundance, Quartz Crystal for clarity, Amethyst for spirituality, Hematite for  grounding and Onyx to help release negativity, and Black Tourmaline for a variety of uses:

It helps to absorb Electromagnetic energy. In today’s world, we are surrounded by electromagnetic energy all the time. You can place Black Tourmaline next to computers, TV screens and any other electronic that is emitting electromagnetic energy. Black Tourmaline is an amazing absorber of energy. It does not have to be cleansed as often as other stones—even though it’s working hard to suck up the EMF’s, so our personal energy field does not absorb as much.

You can energetically grid a room in your home or office by placing Black Tourmaline in all the corners of the room.  This grid has the ability to do several things: it grounds the energy of the room, absorbs any toxic and negative energy, and seals the room with a protective shield. This is important to do if you feel like negative energy keeps entering your space and/or accidents and delays keep occurring. This grid of protection assists in balancing out the energy and dispelling any energies of a lower vibration. You can also use pieces of Black Tourmaline in Quartz, as the quartz crystals surrounding the black tourmaline amplify the protective and grounding energies.

Wear Black Tourmaline or carry it in your pocket or purse to shield yourself from psychic attacks and energy vampires. Black Tourmaline is one of the best crystals for protection, making it a powerful way for how to protect yourself from negative energy. It also helps to put an energetic boundary between yourself and others, so that you don’t pick up other people’s energy, then making it your own. It’s one thing to be loving, compassionate and caring to others, but it’s another to make someone else’s energy your own—to the point of making you feel depressed, anxious or left with no energy.

You can sage the Black Tourmaline to cleanse it.

Black Tourmaline is directly connected to the root chakra, so when it is in your environment, or on your body, it helps you to feel grounded, protected and secure.

Author: Heather Askinosie
Site: http://www.energymuse.com/blog/black-tourmaline-must-have-crystals/
Description: Black Tourmaline is one of the must have crystals that everyone should have. It is one of the strongest crystals for protection against negative energy, and can be used to place a protective shield around yourself as well as your home.