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Updated: May 29, 2025
At first he had thought of some opals and hydrophanes; but these stones, interesting for their hesitating colors, for the evasions of their flames, are too refractory and faithless; the opal has a quite rheumatic sensitiveness; the play of its rays alters according to the humidity, the warmth or cold; as for the hydrophane, it only burns in water and only consents to kindle its embers when moistened.
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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