Are you needing to get rid of old stale and negative energy? OR maybe you just don;t want that annoying co-workers to stop talking to you. You need a piece or maybe quite a few in your life to help shield and protect you . These stones are VERY powerful at cleansing your Aura (an aura is a vibrant ray of color composed of energy that flows around all living things) .
Obsidian also has the power to cut and sever ties from negative people in your life ...like that old lover who wont stop texting you. I also suggest placing a piece in front of your doorway so no bad energy can enter your home.
It's also an excellent crystal to use when you have been doing spiritual or healing on yourself , as it has a strong action to ground you to Mother Gaia.( the ancestral mother of all life). This stone is excellent to assist you to release disharmony that has built up in your day to day life and during work on yourself, including resentment of others, fear and anger. Black obsidian focuses on the root chakra and has a powerful vibration that aids you to ground yourself. Black Obsidian also protects against depression and helps you manage your grief.
A simple way to use this stone is to simply carry it your pocket or purse to repel all the negative vibes you may encounter.
One more thing ..don't forgot to cleanse and charge your new stone , you can do this by a few methods ,my fav is to place it on the windowsill under a full moon, but that's only once a month or even better you can use "I AM Positive " High vibration Aromatherapy spray which will cleanse it, and that can be purchased on this site also.
Small is about about 20 grams and great to carry with you in your pocket or purse.
Medium is about 30 grams ,perfect for protection for your car or at the front doorway or windowsill.
All crystals will be charged with healing Reiki energy to make them more powerful.