Longitude: -58, Latitude: -21.07
This locality consists of nepheline syenite. It is shown as two hills on the map of Milton and Eckel (1959, Plate 1), though not indicated as being alkaline; it is referred to by them as Porto Murtinho. No details known.
MILTON, C. and ECKEL, E.B. 1959. Igneous and metamorphic rocks. In Geology and mineral resources of Paraguay - a reconnaissance. Professional Paper, United States Geological Survey, 327: 12-50. J.H. Palmieri, personal communication, 1981