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Updated: May 31, 2025
Church, who has so successfully studied the beekites, informs me that some of those remarkable bodies present singular points of analogy with tabasheer. By the study of thin sections I have, during several years, been endeavoring to trace the minute structure of some of these substances.
The tabasheers must be studied in their relations on the one hand with certain varieties of the natural semi-opals, hydrophanes, beekites, and floatstones, some of which they closely resemble in their physical characters, and on the other hand with specimens of artificially deposited colloid silica formed under different conditions. Prof.
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