Iceland spar

名词 n.
中文释义

英文释义

名词 n.
  1. A transparent form of calcite, used to demonstrate the polarization of light. countable,uncountable
    — portions of the original aragonite—which make up the nacreous layers of the pearl—had, through “induced paramorphism,” as it was known to the artful sons of Nippon, been selectively changed here and there to a different form of calcium carbonate—namely, to microscopic crystals of the doubly refracting calcite known as Iceland spar.

词形变化

Iceland spars plural
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