Rose quartz (stone of love) is a variety of quartz. The color varies from dark pink to very light, translucent pink. Rose quartz, named after the pink color, is often cracked and usually slightly cloudy. The color-causing substances are titanium and manganese. The color can fade; very small rutile needles can cause a six-rayed star in cabochon cuts. Rose quartz has been processed as a gemstone for a long time. The best rose quartz is mined in Madagascar. Sri Lanka is the location of Cat's eye effect rose quartz. It is also found in Kenya, Mozambique, and Namibia. In Brazil, there are numerous deposits. In Minas Gerais, rose quartz was first found in 1959. Some rose quartz from Brazil exhibits chatoyancy or asterism. In the United States, rose quartz is found in the states of Maine, California, South Dakota, and Colorado. Asterism occurs in rose quartz from New York and Georgia. Russia, Kazakhstan, India, and Japan also supply rose quartz. Only rarely is rose quartz faceted in sizes larger than 20 carats. In the American Museum of Natural History, there is a 625-carat rose quartz sphere that exhibits asterism.