Agate is a variety of chalcedony characterized by either transparency or color patterns, such as multi-colored curved or angular banding. Opaque varieties are sometimes referred to as jasper.

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Wikipedia contributors. (2023, September 27). Chalcedony. In Wikipedia, The Free Encyclopedia. Retrieved November 2, 2023, from https://en.wikipedia.org/w/index.php?title=Chalcedony&oldid=1177486095

Iceland (Wikipedia) Iceland (Icelandic: Ísland, pronounced [ˈistlant]) is a Nordic island country between the North Atlantic and Arctic Oceans, on the Mid-Atlantic Ridge between North America and Europe. It is linked culturally and politically with Europe and is the region’s most sparsely populated country. Its capital and largest city is Reykjavík, which is home to about 36% of the country’s roughly 380,000 residents. The official language of the country is Icelandic.

Agate (Wikipedia) Agate (/ˈæɡɪt/) is the banded variety of chalcedony, 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, while bead necklaces with pierced and polished agate date back to the 3rd millennium BCE in the Indus Valley civilisation.

Chalcedony (Wikipedia) Chalcedony (/kælˈsɛdəni/ kal-SED-ə-nee, or /ˈkælsəˌdoʊni/ KAL-sə-doh-nee) is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic. Chalcedony’s standard chemical structure (based on the chemical structure of quartz) is SiO2 (silicon dioxide).