Reports

Carbonado: Natural Polycrystalline Diamond

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

Abstract

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.