Pyrite is usually found associated with other sulfides or oxides in quartz veins, sedimentary rock, and metamorphic rock, as well as in coal beds and as a replacement mineral in fossils. ... In the Carlin–type gold deposits, arsenian pyrite contains up to 0.37 wt% gold. This grade A+ Pyrite, quarts, cluster is on of a kind! it weighs in at 405.5 grams! And comes with free shipping inside the U.S.A.. It is 4 1/2 inches long, and three inches thick! So please do not wait too have the fine specimen of pyrite on your desk top our table top!