Catalogue and magic properties of the stone -->rus
Description characteristic of the mineral.
Other name of the rare and valuable Ural Russia (CIS) variety of chrysolite - garnet Demantoide (it the varieties of stone, green as a young grass, are very bright and so much sparkle). The word of Demantoide can be translated as similar to the diamond (mute. demant is a diamond, Greek eidos - similar). Demantoide is a rare variety of transparent bright green pomegranates. Their colouring is caused the admixtures of ferrous iron and chrome, the yellow tints of Demantoides are caused connections of titan.
Demantoidy (as "demand", to demand an explanation) were opened on Ural Russia in 1874 on the river Bobrovka (CIS). After presentation of these stone on the Parisian (France, EU) exhibition in 1893 a Demantoides sensation boom began in the world. And in our days the price cost of decorations with Demantoide is high enough: one carat is usually estimated minimum in 100$-600$ dollars. Large stone are rare. The game of light on the verges of Demantoides is determined high refraction of light and reminds about king of jewels - as carbon diamond. Lamplight strengthens this optical effect only. There are Demantoides with the effect of cat's-eye which is created by fibred inclusion. There are stone with beautiful goldish sparks. Besides territory of Russia (Ural, Kamchatka) of Demantoides meet in Italy (EU) and Africa. Found out the beautiful transparent crystals of Demantoide in Italy in a valley Scarlet (the Italian miners sometimes name them the "seed" of earth-flax), in the auriferous mineral deposits of Sri Lanka, in Congo, Zaire, Switzerland, USA (state is Arizona). Demantoide is met also on Chukotka of Russian (CIS).
Demantoide (variety andradite). Poldnevaya д., Sr. Ural, Russia. Photo: © A.A. Evseev.
More dark Demantoide top - unmodified, more light down - from the second
(including river and alluvial) modified Demantoide mineral deposits
Demantoide (variety andradite), Madagascar. Modified (metamorphic). Photo: © A.A. Evseev.
Hardness Mohs of Demantoide 6,5-7 (it most soft Garnet, low hardness and fragility of stone a few reduce his value). Jewellers sometimes named his Russian Ural or Siberian chrysolite, by Russian Ural or by a Bobrovskiy emerald. At the end of XIX - beginning XX century Demantoide was one of the basic jeweller stone exported from Russia. Demantoide is presented mainly the shallow rounded and oval grains measuring from the stakes of millimetre to 10 mm, more large stone meet extraordinarily rarely.
Demantoide - the most valuable jeweller stone groups of Garnet. It is considered that Demantoide are one of the most attractive, dear and valuable semiprecious stone among varicoloured pomegranates. In all of the indicated places Demantoide is presented mainly the shallow rounded and oval grains measuring from the stakes of millimetre to 10 sm, more large stone meet extraordinarily rarely.
Colouring of Demantoide green with a rather yellow, pistachio, emerald and brown tint. Brilliance is diamond. Form of cutting of Demantoide - diamond, allowing it is better to expose his game, rarer step. Stone slipshod process as cabochons. As jeweller raw material green apply and herbs-green Demantoide. Demantoide recommend to use for making of pendants and necklaces, because for rings for him low hardness Mohs. Good stone enter sale in very two-bits, and prices increase constantly on them.
During authentication of Demantoide it is most difficult to distinguish him from a chrysolite, green zircon, rare-earth synthetic pomegranates, shallow stone - from an emerald. To the diagnostic signs of Demantoide it is necessary to take his optical isotropy, high dispersion, lines of absorption, presence of including of byssolite. The fibres of byssolite are disposed parallell to each other, go away bunches from one or a few centers as the so-called "horse tails" or forming a "sun". An especially important sign is the permanent (in 99,3%) being in Demantoides including of fibred actinolite earth-flax (byssolite).
Magic properties of stone.
The connoisseurs of mystic properties of stone consider that the rich green colour of precious Demantoides is instrumental in the origin of sense of calmness and pacification. It is well known also, that this color calms the nervous system.
Poisonous and radioactive risky hazardous cargo stone and minerals
** - are poisonous stone and minerals (mandatory verification is in the chemical analysis laboratory + on toxicity)
** - are radioactive stone and minerals (mandatory verification on a regular dosimeter + prohibition on the opened sales in the case of radio-activity over 24 milliroentgens / hour + additional measures of protection of people)
All of rare stone are subject obligatory verification on a regular dosimeter on the possible level of radiation and in a chemical laboratory on absence default of poisonous and evaporating components, dangerous for a human people and environment nature
- Free download article Very dangerous and potentially dangerous stone and minerals are in Medical stone therapeutics, with pictures, 2010 year, format of PDF, 2.80 Mb (Presentation from scientific of author K.305 of pictures of very dangerous and potentially dangerous natural stone and minerals which on a bad motive or criminal indifference can be illegally used in criminal and "underground" "Medical stone therapeutics"). Rus langv.
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