アンダルサイ​​ト

アンダルサイ​​ト 化学特性,用途語,生産方法

• 化学的特性

  gray, greenish, reddish, or bluish; hardness 7–7.5; used in dental cements and the glass industry, in enamels, ceramics, and as a paint filler [MER06] [HAW93]

• 物理的性質

  Habit: acicular, blocky, prismatic, euhedral crystals.
  Color: usually pink, white, rose, dark green, gray, brown, red, or green or with clouded inclusions.
  Luster: vitreous (i.e., glassy).
  Diaphaneity: transparent to translucent.
  Cleavage: (110) distinct, (100) indistinct, (010) poor.
  Fracture: uneven, splintery, brittle.
  Streak: white.
  Chemical: insoluble in strong mineral acids but attacked by molten alkali-metal hydroxides (e.g., NaOH) and carbonates (e.g., Na2CO3). Heated in Co(NO3 )2 give the Thénard blue color. Non fusible but transforms to sillimanite on heating.
  Other properties: Unfusible but when heated above 1200°C transforms to a mixture of silica and mullite (Al6Si2O13). Dielectric constant of 8.28. Diamagnetic with a specific magnetic susceptibility of –10^–10 m³.kg^–1.
  Occurrence: metamorphosed peri-aluminous sedimetary rocks.

• 調製方法

  It was estimated that in 1987, 90% of the kyanite produced in the United States was used in refractories, 55% of this for smelting and processing iron, 20% for smelting and processing nonferrous metals, and15% for refractories in glassmaking and ceramics.

アンダルサイ​​ト 生産企業

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