When we feel unsafe in our surroundings it can be difficult to concentrate on anything else. Feeling more grounded to mother earth is one of the best ways to increase our feelings of safety and stability.
Our safety is rooted in our root chakra. Dark red, grey or black crystals can help with a healthy root chakra. Garnet, red jasper, hematite, obsidian, smoky quartz, jet, tourmaline and shungite are all good options.
Keeping a small, smooth crystal in your pocket is a good way to feel safe and grounded.