(n.) A cryptocrystalline, translucent variety of quartz, having usually a whitish color, and a luster nearly like wax.
Example Sentences:
(1) The free silicic oxide is presented by low-temperature crystobalite and quartz, more rarely opal and chalcedony.
Conchoidal
Definition:
(a.) Having elevations or depressions in form like one half of a bivalve shell; -- applied principally to a surface produced by fracture.
Example Sentences:
(1) Those differences can be summarized as follows: (1) the occurrence of pronounced, highly curved hackle marks, which could in many instances be mistaken for conchoidal marks;(2)the appearance of the beveled edges bordering the cratering on the side opposite origin of force; and (3) a more apparent tendency toward an inverse relationship of muzzle velocity and energy to radial fracture length and degree of curving along crater boundaries.
(2) These figures were assumed to be the very early stage of formation of conchoidal bodies at the LM level, so-called Schaumann bodies.
(3) Their similitude with other reported intracellular calcareous bodies occurring in malakoplakia, infectious orchitis (Michaelis-Guttman' bodies or calcosphaerites), in beryllium granulomas (conchoid bodies) and sarcoidosis (Schaumann bodies) is discussed.
(4) Sclerotic granulomas with giant cells, conchoidal bodies, iron deposition in the pulmonary stroma--all these lung alterations allowed one to establish a diagnosis of lung berylliosis.
(5) Several patterns of calcification were noted including bubbly, plate-like, elongate, and conchoidal forms.
(6) Lung biopsies in the index cases revealed an interstitial infiltration of inflammatory cells and aggregates of conchoid bodies surrounded by multinucleated giant cells.