Pyroxene (silicates): Aegirine
Diagnostic Card.
Na Fe Si 2 O 6
Crystal system monoclinic
Hardness 6-6.5!
Specific weight 3,43-3,6
Cleavage is perfect
The break in the wrong
Colour dark green
The color of the powder from light yellow to brownish green
Gloss glass, resin
It crystallizes in the form of columnar crystals. Forms are also needles and dense aggregates of small rod-shaped crystals, as well as the radiant-fibrous clusters.
Color dark green, turning black and green. Chemical composition. sodium oxide (Na2O) 13.4% iron oxide (Fe2O3) 34.6%, silicon dioxide (SiO2) 52%; impurities oxide of calcium, manganese, magnesium, aluminum, titanium. Varieties (mixed crystals): aegerine-augite, diopside-aegerine, aegerine-hedenbergite.
Form crystals. Columnar, needle. The crystal structure. Simple ions chain. Cleavage. Perfect for a prism (110). Aggregates. Solid, fibrous.
Diagnostic features.
It is easy to melt in the flame of a candle, turning into black glass. The hydrochloric acid is not soluble. It is easy to melt. Behavior in acids: slightly soluble.
Origin.
Characteristic mineral both intrusive and extrusive alkaline rocks. It also occurs in some alkaline granites and schists.
Place of Birth.
Widely distributed in the rocks of Norway and Greenland, as well as on the Kola Peninsula (Russia). Beautiful crystals found in Magnet Cove (Arkansas, United States).
Aegirine-microcline lived Dmitrievka, Azov Sea, south-east of Ukraine, CIS.
Ukraine, minerals (29 August 2011, 8:49).
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