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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 .
In aventurine quartz chrome-bearing fuchsite produces a green stone, and various iron oxides produce a red stone. The words aventurine and aventurescence derive from the Italian "a ventura", meaning "by chance". This is an allusion to the chance discovery of aventurine glass or goldstone at some point in the 18th century.
Goldstone Goldstone glass under magnification. Goldstone is a type of glittering glass made in a low-oxygen reducing atmosphere.The finished product can take a smooth polish and be carved into beads, figurines, or other artifacts suitable for semiprecious stone, and in fact goldstone is often mistaken for or misrepresented as a natural material.
Cobalt was used for blue glass. Copper and iron were used for green and for various shades of green, blue, and yellow. [70] Manganese was used to remove colors. [71] Although natural gas is the furnace fuel of choice for glassmaking today, the fuel mandated in Murano during the 13th century was alder and willow wood. [5]
Its color is normally apple-green, but varies from turquoise-like cyan to deep green. The darker varieties of chrysoprase are also referred to as prase . (However, the term prase is also used to describe chlorite -included quartz, and to a certain extent is a color-descriptor, rather than a rigorously defined mineral variety.)
In the early 2000s, a new variety of red or green gemstone resembling sunstone and known as "Andesine" appeared in the gem market. After much controversy and debate, most of these gemstones, allegedly sourced from China, were subsequently discovered to have been artificially colored by a copper diffusion process. [ 2 ]
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