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Agate (/ ˈ æ ɡ ɪ t / AG-it) is a variety of chalcedony, [1] which comes in a wide variety of colors. Agates are primarily formed within volcanic and metamorphic rocks.The ornamental use of agate was common in ancient Greece, in assorted jewelry and in the seal stones of Greek warriors, [2] while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus ...
The Lake Superior agate is noted for its rich red, orange, and yellow coloring. This color scheme is caused by the oxidation of iron. Iron leached from rocks provides the pigment that gives the gemstone its beautiful array of colors. The concentration of iron and the amount of oxidation determine the color within or between an agate's bands.
Fordite, also known as Detroit agate, Motor City agate, [1] paint rock, or paint slag, [2] is a lapidarist term for polished pieces of finely layered paint masses from automobile factories. The masses consist of automotive paint which has hardened sufficiently to be cut and polished.
Sapphire (gem corundum of any color except red, especially blue varieties) Sard (a variety of chalcedony/quartz) Satinspar (a variety of gypsum) Selenite (a variety of gypsum) Simetite (a variety of amber) Smoky quartz (a brown or black variety of quartz) Soda niter (synonym of nitratine) Spectrolite (a variety of labradorite) Spessartite ...
Condor agate was discovered and named by Luis de los Santos in 1993. It is found in the mountains near San Rafael , in Mendoza Province , Argentina. This agate exhibits colorful bands and patterns, and has become a popular stone among collectors and jewelry designers.
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The Fairburn Agate is a type of gemstone found in the agate beds of Southwestern South Dakota and Northwestern Nebraska. It is also the state gemstone of South Dakota. [ 1 ] Fairburns are characterized from other types of agate by their colors and the shape of the bands.