A chalcedony occurring in rings various colors and it is utilized as a gemstone, particularly in cameos and intaglios.
A banded number of chalcedony, a cryptocrystalline as a type of quartz.
Chalcedony in synchronous levels of different tones of shade. Its employed for making cameos, the figure being cut in one level aided by the next as a ground.
identical to Mexican onyx.
A deep jet-black color.
a number of quartz, closely allied to agate, described as a structure in synchronous bands varying in shade or in degree of translucency: within the much better types the levels are dramatically defined additionally the colors white with black colored, brown, or red.
An infiltration of pus between he layers for the cornea, resembling a nail.
In conchology: The piddock, Pholas dactylus.
A razor-shell; a bivalve of family members Solenidæ.
a chalcedony with alternating black-and-white rings; found in making cameos