Carbonado in the pores that are common in carbonados, they may have been introduced after carbonado formation. Inclusions of other minerals, rare or nearly absent in the Earth's crust, are found at least partly incorporated in diamond, not just in pores: among such other minerals are those with compositions of Si, SiC, and Fe‑Ni. No distinctive high-pressure minerals, including the hexagonal carbon polymorph, lonsdaleite, have been found as inclusions in carbonados, although such inclusions might be expected if carbonados formed by meteorite impact. Isotope studies have yielded further clues to carbonado origin. The carbon isotope value is very low (little carbon‑13
What It Is to Burn album turned out to be a bit of a disappoinment due to the large amount of hype surrounding the release, giving it an overall 3 stars. "What It Is to Burn" charted at number 99 on the "Billboard" 200 and number 1 on the Heatseekers Albums charts. It also charted at number 177 in the UK. "Letters to You" charted in the UK at number 39. "What It Is to Burn" charted at number 15 on the Alternative Songs chart and number 35 on the Mainstream Rock chart. By April 2003, the album had sold over 200,000 copies in the