rock candy

noun
sugar in large, hard, cohering crystals.

Origin:
1715–25

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World English Dictionary
rock candy
 
n
(US), (Canadian) Also called (in Britain and certain other countries): rock a hard candy, typically a long brightly-coloured peppermint-flavoured stick, sold esp in holiday resorts

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
We made rock candy to illustrate the principles of crystal formation and
  supersaturated solutions.
Examples of crystalline solids are sugar, sugar candy, or rock candy.
Make rock candy to demonstrate how crystals develop in magma.
Using magnifiers, students compare and contrast sugar cubes and rock candy.
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