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Jasper, an aggregate of microgranular quartz and/or cryptocrystalline chalcedony and other mineral phases, [1] [2] is an opaque, [3] impure variety of silica, usually red, yellow, brown or green in color; and rarely blue.
Agate (/ ˈ æ ɡ ɪ t / AG-it) is a fibrous, banded variety of chalcedony. [1] Agate stones are characterized by alternating bands of different colored chalcedony and sometimes include macroscopic quartz. They are common in nature and can be found globally in a large number of different varieties.
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]
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 .
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.
While most agates are translucent, onyx is a variety of agate that is more opaque, featuring monochromatic bands that are typically black and white. [34] Carnelian or sard is a red-orange, translucent variety of chalcedony. Jasper is an opaque chert or impure chalcedony. [35]
A geode of chalcedony richly colored by hematite that gives it its rusty hues and marks it as Akik [contradictory] Aqeeq, akik or aqiq (Arabic: العقيق) means quartz in Arabic, and agate in Turkish, however in the context of rings usually refers to a ring set with a chalcedony stone. Well-known types of chalcedony are carnelian, agate, and ...
Jasper Jasper is a gemstone of the chalcedony family that comes in a variety of colours. Often, jasper will feature unique and interesting patterns within the coloured stone. Picture jasper is a type of jasper known for the colours (often beiges and browns) and swirls in the stone's pattern. Quartz