Minerals

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A mineral is a naturally occurring chemical compound usually of crystalline form and not produced by life processes. A mineral has one specific chemical composition, whereas a rock can be an aggregate of different minerals or mineraloids. The study of minerals is called mineralogy. To meet the definition of “mineral” used by most geologists, a substance must meet five requirements:

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15 Naturally Striped and Banded Rocks

13/10/2026

Some rocks in nature display remarkable patterns of stripes, wavy bands, and contrasting layers, almost as if they had been painted by an artist....

Rocks That Float on Water: Types, Formation, and Examples

12/10/2026

When you drop a rock into water, you usually expect it to sink. Most rocks are denser than water, so they quickly settle to...

Why Is My Rock Magnetic? 8 Common Magnetic Rocks and Minerals

05/10/2026

When you bring a magnet close to a rock and notice that it is strongly attracted, the result can be surprising. If the rock...