Abstract
New chemical analyses as well as optical and X-ray data show that ofiretite and erionite are closely related hexagonal zeolites. Ofiretite is alkaline earth rich and has a Si/ (Al+Fe3+) ratio of 2.48, whereas erionite is generally alkali-rich and has a Si/(Al+Fe3+) ratio of 2.92 to 3.74. Ferric iron may substitute for aluminum in erionites from sedimentary deposits. The optic sign is negative for ofiretite and positive for erionite. Ofiretite characteristically has indices of refraction that are higher than those for erionite. A decrease in the indices of refraction and the cell volume of erionite can be correlated with an increase in the Si/(Al +Fe3+) ratio.
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