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Quartz makes up the majority of Earth's continental crust, and is nearly ubiquitous in the world of geology. The five samples included in this set, though they look completely different, are all made of this simple mineral. A perfect addition to any lesson about formation mechanisms in geology, this set also makes a great addition to any geologic collection. Included in this set are 1" samples of crystalline quartz, milky quartz, obsidian, sandstone, and quartzite.