Oxides and hydroxides: Pyrochroite
Diagnostic card.
Mg (OH) 2
The trigonial trigonometric system
Hardness 2,5
Specific weight 3.2
Cleavage perfect along the base
Color is colorless and bluish-green
Glitter pearl
Pyrochroite crystals are usually tabular or clearly rhombohedral. More common are leafy and lamellar or dense granular masses. The mineral is colorless or blue-green when fresh. In air, it undergoes oxidation and becomes meat-red or violet and, finally, brown-black, passing into various oxides of trivalent manganese. Cleavage is perfect parallel to the base, gloss is pearly on the cleavage surfaces, when the mineral is fresh.
Diagnostic signs.
With a general visual examination, pyrochroids are difficult to recognize. His presence can be guessed by the abundance of accompanying secondary manganese oxides (especially powdered ones) and by the type of deposit.
Origin.
It is present in some ore deposits of complex type, where it is formed, at least in part, due to the oxidation of manganosite.
Place of Birth.
The most famous sites are found in Sweden, in Langbana. Pyrochroite is associated there with rare arsenates and native lead. In the United States, he was found in the Franklin (New Jersey) field. Significant amounts of pyrochroite are found in Japan, in various mines.
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Catalog of minerals and semi-precious stones of the world by groups
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