Garnet refers to a group of minerals, which have slight chemical variations, that adhere to the general formula (Ca,Fe, Mn, Mg)3(Al, Fe, Cr,Ti)2(SiO4)3. Garnet for industrial use was mined in 2001 by six firms, three in New York, two in Montana, and one in Idaho. Output of crude garnet was valued at more than $6.2 million, while refined material sold or used was valued at $13.4 million. Major end uses for garnet were waterjet cutting, 35%; abrasive blasting media, 30%; water filtration, 15%; abrasive powders, 10%; and other end uses, 10%.* *Source - USGS