This rhodochrosite is from the Uchucchacua Mine in the Oyon Province, Lima Department, Peru. The mineral veins found there are mined primarily for silver but they also contain 52 other minerals including rhodochrosite. It is a gangue mineral and a carbonate that contains the elements Mn, C and O. This specimen consists of a mixed quartz and sulfide matrix with an exposed vug that is filled with translucent, pink, crystals that rest on drusy quartz crystals. The crystals have a frosty/resinous luster. They have a complex morphology which includes multiple twinning. The matrix is sawed on the left and rear. This piece measures 2 x 1 1/2 x 1 3/4 inches or 50 x 38 x 44 mm.