Table 1. Cleaned Diatom Opal Contents

Element	mug Per mg Opal	mumol Per mg Opal	Weight Percent
Si	440	15	44
Oa	510	30	51
C	2.5	0.21	0.25
N	0.3	0.02	0.03
aThis is structural O, not that from associated OH or H2O.