Pyroxene (silicates): Fassait
Diagnostic Card.
Ca (Mg, Fe, Al) ( Si, Al) 2 O 6
Crystal system monoclinic
Hardness 6
Specific weight 2,96-3,34
Cleavage is easily seen
The break in the wrong
Colour greenish-yellow, green
Color powder green
Gloss glass
Evidence of a large variability of the mineral species of pyroxene, is the fact that the group, which includes fassait also includes possibly the one hand, a number of minerals diopside - hedenbergite, on the other - the minerals augite with small amounts of iron. Fassait presented is short-type crystals with a variety of faces. They are painted in a more or less dark green depending on the iron content.
Grains seldom crystals (10-30 mm); sectors and regions in the crystals of augite and diopside. Crystals is short-for the most part, sometimes psevdodipiramidalnye. The faces of the prismatic belt m rough, shiny, some crystal head face x and p are a kind of winding hatch. Doubles with pl. accretion (100), sometimes crosswise. Pleochroic by Ng - yellow, yellow-green, pink, gray, purple, pink and purple-brown, golden-brown and reddish; by Nm - pink, brownish and reddish-purple, yellow-green, green; by Np - reddish and brownish-purple, light green, blue-green, light pink, light brown. Some fassaite not pleochroic.
Diagnostic features.
It does not scratch, easy to melt and can not be the action of acids. Lukovo-green, yellow-green, bottle green and bright green color is associated with the content of Fe and Fe in the octahedra; brown, pink, magenta, purple - with the content of Ti in the octahedra. When heated, poorly decomposed in HCl.
Origin.
This is a typical mineral of contact zones formed as a result of physical and chemical changes caused by the introduction of magma into the host rocks, especially limestone, with impurities. It is also found in certain foods volcanism.
Place of Birth.
Beautiful crystals mined near Lake Lagodella Vacca about Adamello (province of Brescia in Lombardy), in Brosseau and Traverselle (province of Turin), in Tiriolo (province of Catanzaro in Calabria) in Italy. Fassait also represented in the volcanic products in Pitigliano (Grosseto), Ariccia (Rome province) and Vesuvius. Interesting items marked in the United States (Montana), Scotland, Sweden and Sri Lanka.
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