Howlite is a naturally white stone with either dark gray or black spider webs throughout. It is commonly dyed to imitate Turquoise and Lapis Lazuli. It is named after the mineralogist Henry How, who found it in Nova Scotia in the 19th century. It is the stone of memory, knowledge and progress. It is also said to eliminate pain, stress and anger. Howlite should be kept away from acids, strong light and cleaning products.