Example Sentences

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The trap-rocks alluded to consist chiefly of feldspathic porphyry and amygdaloid, the kernels of the latter being sometimes calcareous, often chalcedonic, and forming beautiful agates.

From The Student's Elements of Geology by Lyell, Charles, Sir

At a lower part in the same rock, less compact, I found a beautiful chalcedonic cast, apparently of a terebra.

From Three Expeditions into the Interior of Eastern Australia, Volume 1 by Mitchell, Thomas

It seems likely, however, that the solution transuded through the walls generally, penetrating the chalcedonic layers, as Heddle maintained, by osmotic action.

From The Project Gutenberg Encyclopedia Volume 1 of 28 by Project Gutenberg

Her eyes of emerald, stars in her opal face, chalcedonic, looked inexorable, and her bosom of precious stones heaved not.

From Psyche by Couperus, Louis

The minerals, under different names, are 567 essentially the chalcedonic variety of quartz, and the differences of colour they present are due to the presence of variable proportions of iron and other foreign ingredients.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" by Various