Chlorites (silicates): Klinochlor
Diagnostic card.
(Mg, Al) 3 (OH) 2 Al Si 3 O 10 Mg 3 (OH) 6
Singonia monoclinic
Hardness 2
Specific weight 2.5-2.7
Cleavage is perfect
Green colour
Glitter pearl
It is represented by lamellar crystals of pseudohexagonal outlines, sometimes dense scaly aggregates. The plates have perfect cleavage and pearlescent luster at the base; They are flexible, but not elastic.
Coloration is green, varied in intensity, sometimes it can turn into bluish, light yellow and even almost white, as in the variety known as leichtenbergite. Black-green to bluish-green (kochubei pink, violet) color. The clinochlore shown in the photo below from Russia is called seraphinite and is used in jewelry production as inserts-cabochons.
Chemical composition. Strongly fluctuates; Magnesium oxide (MgO) 17-34.5%, ferrous oxide (FeO) 1.8-12.2%, iron oxide (Fe2O3) 0-3%, alumina (Al2O3) 13.1-17.6%, Silica (SiO2) 28.3-33.9%, water (H2O) 11.7-14.2%. Impurities: calcium oxide (CaO) up to 9%, manganese oxide (MnO) up to 23%, ferric chloride (Cr2O3) up to 8% (chromium-containing clinochlor is called kochubeite). Leaflets are flexible, but brittle (not elastic). The shape of the crystals. Tabular, pyramidal, rhombohedral. Crystal structure. Layered lattice. Class of symmetry. Presumably prismatic - 2 / m. Cleavage. Very perfect in terms of the basis (001). Aggregates. Scaly, leafy.
Diagnostic signs.
When heated, it decomposes into leaves, not melting. It dissolves in strong acids, leaving a siliceous residue. Does not melt. Behavior in acids. Completely decomposes in concentrated H2SO4.
Origin.
Klinochlor has a secondary origin. It is widely distributed in nature. Associating with talc, episodes such as chlorite and talc shales occur in metamorphic rocks.
Deposits and applications.
Klinochlor is also installed in the rocks of many places in the western Alps. Its crystals are in Akhmatovo in the Urals, in Tilly-Foster in the state of New York (in association with chondrodite), West Chester in Pennsylvania (USA) and Zillertale in Tyrol (Austria).
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Catalog of minerals and semi-precious stones of the world by groups
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