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What is a crucible?

What is a crucible? Here are some definitions.

Noun
  1. (chemistry) A cup-shaped piece of laboratory equipment used to contain chemical compounds when heating them to very high temperatures.
  2. A heat-resistant container in which metals are melted, usually at temperatures above 500°C, commonly made of graphite with clay as a binder.
  3. The bottom and hottest part of a blast furnace; the hearth.
  4. (figuratively) A very difficult and trying experience, that acts as a refining or hardening process.
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Examples
Fokine premises his version of the tale on the idea that a harem is a crucible of uncontainable desire.
The crucible holder is secured to a lid of the furnace, and the furnace lid is guided along upwardly extending guide rods.
He crushed the mineral and then fused half of it with borax in a platinum crucible.
Argon was extracted in a molybdenum crucible by melting through induction heating with a metal line.
An assistant swung the converter back into the crucible, leaving the smith free to turn his attention to the liquid steel in the mould.
An amount of flux is added to the crucible and the mixture is fused at high temperature in the furnace.

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