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Chalcedony's standard chemical structure (based on the chemical structure of quartz) is SiO 2 (silicon dioxide). Chalcedony has a waxy luster, and may be semitransparent or translucent. It can assume a wide range of colors, but those most commonly seen are white to gray, grayish-blue or a shade of brown ranging from pale to nearly black.
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 ...
Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]
Aventurine is used for a number of applications, including landscape stone, building stone, aquaria, monuments, and jewelry. Aventurine is a form of quartzite , characterised by its translucency and the presence of platy mineral inclusions that give it a shimmering or glistening effect termed aventurescence .
As of 2022, the global jewelry market was valued at approximately $270 billion and is projected to grow to over $330 billion by 2026. In 2022, the leading countries in the jewelry and watch market revenue were China, India, and the United States. [85] The Asia Pacific region dominated the jewelry market with a market share of 39.28% in 2024 [86 ...
Jade bird pendant from Costa Rica. Jadeite is presumed one of the most precious materials of Pre-Columbian Costa Rica. It, along with other similar-looking greenstones (e.g. chalcedony, serpentine, and green jasper) were cherished and worked for years. Jadeite was used to decorate the body and was presumably a symbol of power.