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When a substance that has NO cleavage breaks, the fractures look like ice-cream when it is scooped. These are called conchoidal fractures. They have sharp edges and were used by cavemen as cutting and scraping tools. In the list below, one is a MINERAL with conchoidal fracture. Which is it?
Group of answer choices
Mica
Obsidian
Quartz
Calcite
Sagot :
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