Browse Howlite tumbles, bracelets, carvings and jewellery featuring a white surface with soft grey or black veining. Howlite is a calcium borosilicate mineral with a calm, marble-like appearance that works well in simple jewellery and monochrome crystal displays. Traditionally associated with patience, relaxation and restful sleep, it is a popular affordable gift. White Howlite is also sometimes dyed, so check individual product details for treatment information.