Silicates: Chlorite
Diagnostic card.
Fe Al 2 (OH) 2 O SiO 4
Monoclinic and triclinic syngonia
Hardness 6,5
Specific weight 3.56-3.61
Cleavage is perfect
Fracture scaly
Color green, dark gray
Color in powder light green
Glitter from glass to pearly
It is represented by lamellar crystals of pseudohexagonal form. Due to the perfect cleavage it is divided into fragile plates, which differ neither in flexibility nor in elasticity. It is more often found in the form of dense aggregates of scaly or bundle composition, the color of which varies from light green to dark gray. Chloritoid shines, the shine is glass, on the surfaces of cleavage - pearly.
Diagnostic signs.
It dissolves in sulfuric acid, refractory in the flame of a candle.
Origin.
It occurs only in metamorphic rocks of the lower stages of metamorphism, enriched with aluminum, iron, and manganese; In them it is associated with garnet, muscovite, chlorite, kyanite and staurolite.
Place of Birth.
Among the numerous locations we will mention Ural, Izmir (Turkey), the Spitsbergen archipelago (Norway), in addition, numerous areas in the USA (for example, Rhode Island), Canada, Uganda, Australia, Sweden. In Italy, chlorite is often found in the Western Alps; For example, a manganese-containing species was found in Saint-Michel (Aosta) and Biella; In addition, chloritoid occurs in Zermatt (Switzerland) and in Pregrain (Austria).
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