Grenades (silicates): Uvarovit
Diagnostic card.
Ca 3 Cr 2 (SiO 4 ) 3
Cubic amount of cubic zirconia
Hardness 6,5-7
Specific weight 3,4-3,8
Cleavage is absent
Cracked shell
Color emerald green
Color in powder white
Glitter glass diamond
Uvarovit is named after the Russian Minister of Education Count A. Uvarov (1786-1855). Deposits are known in the Urals, in Finland, Poland, India, the USA and Canada. In faceted form, it can be confused with an emerald, usually found in the form of crusts of small crystals along cracks in ultrabasic rocks.
This is a rare garnet, usually crystallized in the form of small crystals, rounded shape, with shaded faces, without cleavage. Forms also crusts or granular masses. The color is emerald green, in powder - white. Glitter is glass and semi-diamond; The mineral is transparent or translucent.
Diagnostic signs.
Does not lend itself to acids and does not melt.
Origin.
It is formed in serpentinites enriched in chromium, in association with chromite; In metamorphic rocks rich in iron and manganese and ore minerals (skarns), in metamorphosed limestones.
Deposits and applications.
The most famous samples of this mineral come from Bisersk in the Urals, Outokumpu (Finland) and Cap-Daglyary (Turkey). In association with diopside, he is also present in Oxford and in Quebec, Canada. In Italy, uvarovite is found in Saint-Marcel (Val d'Aosta region) and Val Malenko (Lombardy region). Uvarovite can be used as a gem. But, since its commercial use is limited due to its extreme rarity, it has an exclusively scientific and collector interest.
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Poisonous and radioactive dangerous stones and minerals
** - poisonous stones and minerals (mandatory check in the chemical laboratory + explicit indication of toxicity)
** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
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