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Amethyst is a violet variety of quartz. The name comes from the Koine Greek αμέθυστος amethystos from α - a- , "not" and μεθύσκω ( Ancient Greek ) methysko / μεθώ metho ( Modern Greek ), "intoxicate", a reference to the belief that the stone protected its owner from drunkenness . [ 1 ]
An early use of the piezoelectricity of quartz crystals was in phonograph pickups. One of the most common piezoelectric uses of quartz today is as a crystal oscillator. The quartz oscillator or resonator was first developed by Walter Guyton Cady in 1921. [92] [93] George Washington Pierce designed and patented quartz crystal oscillators in 1923.
It was common in many cultures to use the name "topaz" for any golden yellow stone. The name "citrine" was first used in English in the 14th century. [12] Its popularity greatly increased once it was discovered citrine could be produced artificially by heating amethyst or smoky quartz.
Toggle the table of contents. ... Quartz. Amethyst (var.) Ametrine (var ... There are a number of artificial and lab grown minerals used to produce gemstones. These ...
Stones can be used for amazing and creative hacks
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Heat can either improve or spoil gemstone color or clarity. The heating process has been well known to gem miners and cutters for centuries, and in many stone types heating is a common practice. Most citrine is made by heating amethyst, and partial heating with a strong gradient results in "ametrine" – a stone partly amethyst and partly citrine.
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