These are from Brazil showing great natural colors of genuine untreated smoky Quartz. They are believe to transforms negative emotions and negative energy patterns. Grounding. Protective. Good to use during meditation as it helps you relax and open while staying grounded. Stone of cooperation. Good for groups. Helps relieve fluid retention. Smoky Quartz helps to overcome Depression, Nightmares, Stress. Smoky, root beer, or chocolate-colored clear crystals. The clearest, most intense ones powerfully open the Crown Chakra emanating light down the Root Chakra, inducing Alpha/deep meditation for channeling/higher guidance, deep relaxation, lovingness. Ancient use also to stimulate meridians, kundalini, and correct fertility/PMS/reproductive imbalance. Stores info well. Alleviates fear, anxiety, depression, emotional Dense, dull, solid/semisolid black/brown, less attractive. Very grounding, when placed opposite other smokies. May feel dense, heavy, nonconductive Many were irradiated to turn them this flat, dark color with white edge of base. If so, they’re not useful for conducting light/healing, thus less useful for wearing or healing. This medium-to-dark brown crystal found in the US, Brazil, and Scotland. A word of warning is in order regarding choosing Smoky Quartz crystals. Its dark color is caused by impurities, usually carbon, iron, or titanium. But the color of some Smoky Quartz is caused by the effects of minute amounts of decaying radium, within the crystal itself. Because of the presence of this natural low-grade radiation, Smoky Quartz is good for people with radiation-related illness or those in chemotherapy. It is best to avoid the heavily irradiated crystals. Most gemstone and crystal stores do not sell them, and most gem experts advise against using them in layouts. Natural Smoky Quartz crystals, like other brown stones, are closely in tune with the anchoring energy of the earth. Often sued for ailments of the lower torso. The reproductive organs, muscle tissue, heart, and nervous system all profit. Heightens your understanding of nature and concern for the environment.