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Chrysoprase, chrysophrase or chrysoprasus is a gemstone variety of chalcedony (a cryptocrystalline form of silica) that contains small quantities of nickel. Its color is normally apple-green, but varies from turquoise -like cyan to deep green.
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]
Chrysoprase. Chrysoprase (also spelled chrysophrase) is a green variety of chalcedony, which has been colored by nickel oxide. (The darker varieties of chrysoprase are also referred to as prase. However, the term prase is also used to describe green quartz and to a certain extent is a color-descriptor, rather than a rigorously defined mineral ...
TLR cameras, SLR cameras, folding cameras, CCD and SLR camera lenses, large-format cameras Sigma: Japan: Compact digital cameras and SD-series DSLRs Sony: Japan: Cyber-shot compact digital cameras, α DSLRs, and Sony NEX MILCs Tevion: Germany: Compact digital cameras and trail cameras Thomson: France: Waterproof digital camera Traveler: Germany ...
Although the term “digicam” originated as a syllabic abbreviation for “digital camera”, it is now used primarily to refer to an old compact digital camera or, in other words, a discontinued point-and-shoot camera with a fixed lens. [32] [33] [34] Digicams emphasize portability and ease of use, and they often include a built-in flash. [35]
Variscite has been used in Europe to make personal ornaments, especially beads, since Neolithic times. Its use continued during the Bronze Age and in Roman times although it was not until the 19th century that it was determined that all variscite used in Europe came from three sites in Spain, Gavá (Barcelona), Palazuelo de las Cuevas (Zamora), and Encinasola (Huelva).