What is the difference between a mineral and a rock?
What is the difference between a mineral and a rock?
While they are often used interchangeably in everyday conversation, minerals and rocks are fundamentally different geological concepts.
What is a Mineral?
A mineral is a naturally occurring, inorganic (non-living) solid that has a definite chemical composition and an ordered internal atomic structure (crystal lattice). This means every single specimen of a specific mineral is made of the same chemical ingredients arranged in the exact same repeating geometric pattern. Examples include quartz, diamond, gold, and feldspar.
What is a Rock?
A rock, on the other hand, is a naturally occurring solid mass or aggregate of minerals, mineraloids, or even broken pieces of other rocks. Unlike minerals, rocks do not have a specific chemical formula. Instead, they are mixtures. For example, granite is a rock made up of a mixture of quartz, feldspar, and biotite minerals.
Key Differences at a Glance
- Composition: Minerals have a fixed chemical formula; rocks are made of mixtures of minerals.
- Structure: Minerals have an orderly internal crystal structure; rocks do not necessarily have a uniform crystal structure.
- Variety: There are thousands of known minerals, which are categorized into three main rock types: igneous, sedimentary, and metamorphic.