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Updated: May 16, 2025
It is a compound of about 90 silica, and 10 water. The finest specimens come exclusively from Hungary. There is a variety of opal called Hydrophane, which is white and opaque till immersed in water; it then resembles the former. Why is the sapphire genus so highly prized? Because, after diamond, it is the hardest substance in nature.
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.
Fearing lest fever should attack Red Chicken, he had prepared a decoction from the hollow joints of the bamboo, which he administered in frequent doses from a cocoanut-shell. It was milk-white, and became translucent in water, like that beautiful variety of opal, the hydrophane.
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