Obsidian, also known as the "grief stone" absorbs negative energy and provides comfort and healing during times of grief and mourning. Directly working with your root chakra, this stone will help with grounding and protective energy.  It can be held in the hand or in a pocket as an energetic ally and a tool for releasing and letting go.  
This energetic tool is also an excellent gift for children who are grieving. Rubbing the thumb against the convex of the stone can create a tangible way to transmute feelings of grief, and the intentional act of cleansing the stone in moonlight or salt can provide some much needed ritual, bringing a sense of control and purpose into a situation that can otherwise leave one feeling powerless.