“talc”的概念、定义、翻译、参考文献-科学参考

talc

Chemistry

A white or pale-green mineral form of magnesium silicate, Mg₃Si₄O₁₀(OH)₂, crystallizing in the triclinic system. It forms as a secondary mineral by alteration of magnesium-rich olivines, pyroxenes, and amphiboles of ultrabasic rocks. It is soaplike to touch and very soft, having a hardness of 1 on the Mohs scale. Massive fine-grained talc is known as soapstone or steatite. Talc in powdered form is used as a lubricant, as a filler in paper, paints, and rubber, and in cosmetics, ceramics, and French chalk. It occurs chiefly in the USA, Russia, France, and Japan.

Geology and Earth Sciences

A member of the 2:1 phyllosilicates (sheet silicates) with composition Mg₆[Si₄O₁₀]₂(OH)₄; sp. gr. 2.58–2.83; hardness 1 (it has the lowest hardness on Mohs’s scale of hardness); monoclinic; rare crystals are tabular, often massive; white to green; cleavage perfect {001}; massive talc (soapstone or steatite) can be formed during the low-grade metamorphism of siliceous dolomites; and as a secondary mineral during hydrothermal alteration of ultrabasic igneous rocks along shear planes. It is associated with serpentization with serpentine changing to talc and magnetite by addition of CO₂. It is used extensively as a mineral filler.

单词	talc
释义	talc Chemistry A white or pale-green mineral form of magnesium silicate, Mg₃Si₄O₁₀(OH)₂, crystallizing in the triclinic system. It forms as a secondary mineral by alteration of magnesium-rich olivines, pyroxenes, and amphiboles of ultrabasic rocks. It is soaplike to touch and very soft, having a hardness of 1 on the Mohs scale. Massive fine-grained talc is known as soapstone or steatite. Talc in powdered form is used as a lubricant, as a filler in paper, paints, and rubber, and in cosmetics, ceramics, and French chalk. It occurs chiefly in the USA, Russia, France, and Japan. Geology and Earth Sciences A member of the 2:1 phyllosilicates (sheet silicates) with composition Mg₆[Si₄O₁₀]₂(OH)₄; sp. gr. 2.58–2.83; hardness 1 (it has the lowest hardness on Mohs’s scale of hardness); monoclinic; rare crystals are tabular, often massive; white to green; cleavage perfect {001}; massive talc (soapstone or steatite) can be formed during the low-grade metamorphism of siliceous dolomites; and as a secondary mineral during hydrothermal alteration of ultrabasic igneous rocks along shear planes. It is associated with serpentization with serpentine changing to talc and magnetite by addition of CO₂. It is used extensively as a mineral filler.
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