Home Geochemistry Mineral Mineralogy. How Do Agates Form? Agate is a cryptocrystalline variety of silica, chiefly chalcedony, characterised by its fineness of grain and brightness of color. Cryptocrystalline means that the mineral crystals are so fine that they are only vaguely seen in patterns and fine variations. A distinctly banded fibrous chalcedony. Most agates occur as nodules in volcanic rocks or ancient lavas, in former cavities produced by volatiles in the original molten mass, which were then filled, Untitled - Agathocles / Kak (3) - From Factory To Cemetary, wholly or partially, by siliceous matter deposited in regular layers upon the walls.
Agate has also Untitled - Agathocles / Kak (3) - From Factory To Cemetary known to fill veins or cracks in volcanic or altered rock underlain by granitic intrusive masses. Such agates, when cut transversely, exhibit a succession of parallel lines, often of extreme tenuity, giving a banded appearance to the section.
Such stones are known as banded agate, riband agate and striped agate. Many agates are hollow, since deposition has not proceeded far enough to fill the cavity, and in such cases the last deposit commonly consists of drusy quartz, sometimes amethystine, having the apices of the crystals directed towards the free space so as Untitled - Agathocles / Kak (3) - From Factory To Cemetary form a crystal-lined cavity or geode.
Note: Agate is not simply "banded chalcedony. Agatha, Aroostook, Maine, United States. Total Records. Search records in Saint Agatha Fuck You Cemetery. Add Relationship. My Photo Requests. Not finding what you are looking for? Make a photo request to let nearby users know who you are looking for.
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