Carbonado: Natural Polycrystalline Diamond

Science  22 Aug 1969:
Vol. 165, Issue 3895, pp. 799-802
DOI: 10.1126/science.165.3895.799


Carbonados are porous aggregates of mostly xenomorphic diamond crystallites ranging in diameter from a fraction of a micron to over 20 microns. Crystalline inclusions (up to 3 percent) occur in the pores of the crystallites and consist mainly of orthoclase and small amounts of other igneous, metamorphic, and secondary minerals.