Flame photometry was used for Na and K and atomic absorption spectrometry for the remainder of the minerals studied. Phosphorus and iron contents were determined colorimetrically (Dickman & Bray, 1940) from the triple acid-digested samples. HCN was analyzed following procedures outlined in O’ Brien, Taylor, and Poulter (1991). The results were expressed as mg HCN equivalents/kg dry weight basis (mean ± SD) based on at least three replicate analyses.