Amphiboles (silicates): Tremolite
Diagnostic card.
On the picture. Pencil-shaped radiant aggregates from Baguette (Ontario province, Canada). Below: crystals of tremolite (Paso-San Giacomo, province of Verbania).
Ca 2 Mg 5 (OH, F) 2 (Si 4 O 11 ) 2
Singonia monoclinic
Hardness 5,5-6
Specific weight 2,9-3,1
Cleavage is easily manifested
Crack irregular
Color is colorless, differently colored
Color in powder white
Glitter glass
It is represented either by elongated-prismatic crystals, or - more often - by columnar and fibrous aggregates, usually of a radiant structure, which in this case is called grammar.
Chemical composition. Calcium oxide (CaO) 13.8%, magnesium oxide (MgO) 24.6%, silica (SiO2) 58.8%, water (H2O) 2.8%. Mineral brittle, brittle. The shape of the crystals. Long prismatic, needle, hair-like, felt-like aggregates. Crystal structure. Double chains (ribbons) of SiO4 tetrahedra. Class of symmetry. Probably prismatic - 2 / m. Cleavage. According to the prism (110). Aggregates. Radiant.
Diagnostic signs.
Does not dissolve in hydrochloric acid; Easily melts in the flame of a candle. Melts with difficulty, forming a colorless glass. Behavior in acids. Slightly soluble.
Origin.
Tremolite is a common mineral of fully recrystallized limestones and dolomites, converted to contact with igneous rocks. It is also present in serpentinite shales and in some peridotite rocks.
Place of Birth.
Tremolite is quite famous. Its aggregates of white color are found in the sugar-like dolomites in Campolongo in the canton of Ticino (Switzerland). It is represented in many places in the alpine zone of the Piedmont and Lombardy regions.
Application.
Fibrous trimolite differences are used as heat and sound insulation materials.
Tremolite. Ontario, Canada. Photo: © А.А. Evseev.
Tremolite. Prismatic crystals (up to 9 cm). Bernina, Alps, Italy, the EU. Photo: © А.А. Evseev.
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