Youngite ( "Moss agate-red") "eyes" pendant from the USA.

Youngite is a variety of agate that is provided a local name for agatized limestone breccia clasts rehealed with bluish-gray chalcedony and drusy quartz. This chalcedony and quartz usually also form around the exterior and lines the vugs of the material. It comes from one location only and is no longer mined, making this rare. Youngite is only found near Guernsey, in Eastern Wyoming. The most notable locale that produced some excellent specimens is the Hartville Uplift. Although specimens are still available from time to time, the Wyoming locations are now closed.

Agate is a translucent, sometimes opaque variety of quartz and a sub-variety of chalcedony. The chemical structure of agate is identical to jaspis, flint, hear dial and is often found together with opal. The colorful, striped specimens are used as gemstone. The name agate comes from the Greek Ἀχάτης, Achates, the name of the current river Dirillo in the south of Sicily, where agates and other chalcedonies found. Traditionally agate was worn as a lucky stone, or to cure. There were also consumer items like buttons made of agate. Some medicinal effects is attributed to agate, such as protection during pregnancy, for headaches, skin disorders, and balance disorders. Agate belongs according to various literature on the zodiac Aquarius, Taurus, Scorpio and Gemini. Agate Connections form as a solution of silica in cavities in older rocks. The stones can be artificially stained in order to obtain color combinations that are more vivid than those found in nature. The major sources of agate are Brazil, Uruguay and the United States (Oregon, Washington and around Lake Superior). Closer Netherlands and Belgium are also agate found in the Hunsrück in Germany. Chemical composition: SiO 2 + Al, Ca, Fe, Mn Crystal System: belongs to chalcedoonachtige quartz crystal, trigonal. Fission: None. Color: light blue or gray but can also be green stripe color: none. Shine: glass gloss, matt, satin finish. Hardness (Mohs): 6.5 to 7. Average density: 2.65 kg / dm3. Transparency: transparent to translucent.