Sphere from Tsitrin 52,3 mm 199 gr
The sphere 199gr, Ø52,3мм, the highest optical purity, free of defects and inclusions, is made of a natural crystal of quartz of Tsitrin No. 2526 by weight 670gr, the size 100kh95kh75mm.
The sphere is made of the perfect natural crystal of the quartz of the highest optical purity produced in South Ural in 1977 and put in the State reserve as piezooptical quartz for needs of MO of Russia. In 2016 under the state contract quartz was acquired by LLC Rosmark-N of Novosibirsk which organized processing of this material in finished products.
There are following dokumnta on raw materials (quartz crystals): on its acquisition, primary certificates and inventories on each party in volume of a packing-case of crystals, Expert opinions of Institute of geology and mineralogy of V. S. Sobolev of the Siberian office of the Russian Academy of Sciences (IGM of the Siberian Branch of the Russian Academy of Science) of Novosibirsk on selective copies of the same crystals (Rock crystal, Raukhtopaz, Tsitrin, the Morion).
The sphere is followed by the following photos:
- product photo;
- a photo of a crystal of which the sphere is made (with drawing by paint of number, weight, and also a symbol of the size of a monooblasta of a crystal);
- a photo of primary certificate of pyezokvarets (a quartz crystal) on a packing-case at which there is this crystal;
- a photo of the Expert opinion of IGM of the Siberian Branch of the Russian Academy of Science on this type of crystals.
The crystal monooblasta size percentage of its gross weight is put with a symbol paint on a crystal in the form of a combination of the letters O and V, namely: O. - 30%; About - 35%; V - 40%; without letter - 50%; VV - 60%; VVV - 70%.