chalcedony
noun
a microcrystalline, translucent variety of quartz, often milky or grayish.
chalcedonic
-
a word derived from
chalcedony.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
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 Sir Charles Lyell
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 Thomas Mitchell
When examining the agates, the chalcedonic and jaspery rocks, some of the limestones, and even the bright red sandstones, I was forcibly struck with their resemblance to deposits formed in the neighbourhood of volcanic action.
From Geological Observations on South America by Charles Darwin
In sinking wells in this district the chalcedonic strata seem to be the lowest.
From Geological Observations on South America by Charles Darwin
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
