Epidotes (silicates): Osumilit
Diagnostic card.
(K, Na, Ca) (Mg, Fe2 +) 2 (Al, Fe 2+ , Fe 3+ ) 3 Al 2 Si 10 O 30
Shingoniya hexagonal
Hardness is variable
Specific weight 2.64
Black color
It crystallizes in a hexagonal system, in the form of small crystals of a short-prismatic tabular form. The color is black, the mineral is light.
Diagnostic signs.
Originally was confused with cordierite and described under its name, because it is similar to it in structure and composition.
Origin and deposits.
It is encountered together with stridymite and quartz in effusive rocks of the liparite type on the Sakurayama volcano in Japan. Beautiful crystals are found in the Monte Arc group in Sardinia.
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Poisonous and radioactive dangerous stones and minerals
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** - 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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