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Herkimer diamonds are double-terminated quartz crystals discovered within exposed outcrops of dolomite in and around Herkimer County, New York, and the Mohawk River Valley in the US. [1][2] They are not diamonds; the "diamond" in their name is due to both their clarity and well formed faces. Because the first discovery sites were in the village ...
Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...
The crystal skull at the British Museum, similar in dimensions to the more detailed Mitchell-Hedges skull. Crystal skulls are human skull hardstone carvings made of clear or milky white quartz (also called "rock crystal"), claimed to be pre-Columbian Mesoamerican artifacts by their alleged finders; however, these claims have been refuted for all of the specimens made available for scientific ...
The name arose because it looked like rock crystal or clear quartz, which had long been carved into various types of vessels and small hardstone carvings. [36] Rock crystal was said to have magical qualities and in the Middle Ages was often used in Christian religious objects. Cristallo became very popular. [31]
Amethyst is a purple variety of quartz (SiO. 2) and owes its violet color to irradiation, impurities of iron (Fe3+. ) and in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. [2][3][4] The irradiation causes the iron Fe3+.
It is a clear and colorless variety of quartz. Goossens became the first to set it into pieces of jewelry; he felt that its delicate and inexpensive attributes were well suited to costume jewelry. He also utilized bronze, shells, pearls, colored and, as mentioned, natural rock crystal in necklace, brooch, bracelet and earring designs.
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