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Generally, dark navy blue chrysocolla is too soft to be used in jewelry, while cyan, green, and blue-green chrysocolla can have a hardness approaching 6, similar to turquoise. Chrysocolla chalcedony is a heavily silicified form of chrysocolla that forms in quartz deposits and can be very hard and approach a hardness of 7. [9] [10] [11]
Egyptian faience was very widely used for small objects, from beads to small statues, and is found in both elite and popular contexts. It was the most common material for scarabs and other forms of amulet and ushabti figures, and it was used in most forms of ancient Egyptian jewellery, as the glaze made it smooth against the skin.
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.
Well known for its blue color, sodalite may also be grey, yellow, green, or pink and is often mottled with white veins or patches. The more uniformly blue material is used in jewellery, where it is fashioned into cabochons and beads. Lesser material is more often seen as facing or inlay in various applications.
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 .
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium, with the chemical formula Cu Al 6 (PO 4) 4 8 ·4H 2 O.It is rare and valuable in finer grades and has been prized as a gemstone for millennia due to its hue.
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