These autunite crystals are from the Nanjingqiao U deposit in Pingjiang County, Yueyang, Hunan, China. Two different uranium minerals are said to come from this locale and one is autunite. It is a uranium phosphate that contains the elements Ca, U, P, O and H. This piece is a small miniature consisting of book-like crystal clusters of yellow to green autinite crystals on a druse quartz covered pegmatite matrix. The crystals are like thin square pages within the books. This piece measures 1 1/4 x 3/4 x 1/2 inches or 32 x 19 x 12 mm.