Let's Talk about Crystallization in the Naica Mine/6 - Glass and Crystal
Wikijunior:Let's Talk about Crystallization in the Naica Mine
5 - Gypsum Crystals in Both Caves
6 - Glass and Crystal
7 - Everything Is Made of Atoms
What is a crystal? Is the man-made glass in a window the same as the crystals you can find in nature?
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