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==Key Stage 2==
===Meaning===
[[File:GraniteCrystals.png|right|300px|thumb|A [[Magnify|magnified]] image of granite showing the '''crystals'''.]]
A '''rock crystal''' is a [[Rock Grain|rock grain]] with sharp edges.
===About Rock Crystals===
: '''Rock crystalsCrystals''' are usually shiny and will sparkle in the light.: '''Rock crystalsCrystals''' have usually have regular shapes like a square, rectangle or parallelogram.: A '''rock crystalCrystal''' is made of only one type of mineral but different minerals make different '''crystals'''.