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Oregon is known for several different varieties of agate. It is probably best known for its thunder eggs, which form in rhyolitic ash and have a brown rhyolite shell that is usually filled with blue and white agate. Holley blue agate (also spelled "Holly blue agate") is a rare lavender to blue agate found only near Holley, Oregon. [9]
Agate. Agate is a fibrous, banded variety of chalcedony that occurs in a variety of colors and patterns. [9] Iris agate shows exceptional iridescence when light (especially pinpointed light) is shone through the stone. Landscape agate is chalcedony with a number of different mineral impurities making the stone resemble landscapes. [10]
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.
Onyx is a variety of quartz analogous to agate and other crypto-crystalline species. It is composed of different layers of variously colored chalcedony much like banded agate in structure, but the layers are in even or parallel planes. This makes it well adapted for the cutting of cameos and was much used by the ancients for that purpose.
There are over 300 types of minerals that have been used as gemstones. Such as: A–B. Actinolite. ... Chalcedony (var.) Agate. Iris agate; Onyx; Sardonyx; Bloodstone
Other colors of chalcedony may also occur in Indian bloodstone, such as white, yellow, or blue. This semiprecious stone should not be confused with other ornamental stones that contain red jasper. Setonite, also called African bloodstone, is composed of red jasper, grey chalcedony, and pyrite .
Minerals are distinguished by various chemical and physical properties. Differences in chemical composition and crystal structure distinguish the various species. Within a mineral species there may be variation in physical properties or minor amounts of impurities that are recognized by mineralogists or wider society as a mineral variety.
Chung dzi are believed to have similar properties to real "eyed" dzi; they are less valuable, but they are highly prized by Tibetans and also considered a variety of dzi. Another similar type of bead is called Luk Mik ("goat's eye") – it is a naturally formed "one-eyed" coin-shaped [3] agate (pictured). Luk Mik are the preferred dzi for ...