Scanning electron microscopy and secondary ion mass spectrometry of the unequilibrated CH chondrite Pecora Escarpment (PCA) 91467 revealed four carriers of isotopically heavy N: (1) aggregates of carbonaceous material and silicates, (2) iron-nickel metal grains with fine Fe-Cr sulfide inclusions, (3) Si-rich Fe-Ni metal associated with Fe-sulfide and (4) hydrated areas in the matrix. N in carbon-silicate aggregates is isotopically heavy (delta (15)N is as high as 2500 parts per thousand), whereas the other elements are isotopically normal, suggesting interstellar origin of carbonaceous material in the aggregates. Based on isotopic and textural evidence, we suggest that the carriers (2) and (3) were formed by brief heating in the solar nebula, whereas the carrier (4) was formed in a parent-body asteroid. The carbon-silicate aggregates are likely to be related to interstellar graphite found in Murchison and may also be the source of heavy N in bencubbinites.