Mineral

What Are Minerals?

Minerals are solid things found in nature. They have a special mix of chemicals and shapes inside called crystal structures. Minerals are very important because they make up rocks and are in many things we use every day. For example, the mineral quartz is used in watches and electronics.

Where Do Minerals Come From?

Minerals are found all around us, inside the Earth. They are part of rocks, which are like big piles of minerals stuck together. Some minerals are also found in water or even in living things, like plants and animals. Scientists study minerals to learn about the Earth and how it works.

Fun Facts About Minerals

• Many Types: There are many kinds of minerals. Some are called silicates, which have silicon and oxygen. Others are oxides, carbonates, sulfides, and halides. Each group has its own special properties.
• Useful Minerals: Minerals have many uses. For example, muscovite, a type of mica, can be used for windows, as a filler, or as an insulator.
• Gems: Some minerals are beautiful and rare, making them special decorations. About 20 minerals can be used as gems, like ruby and sapphire.

How Do We Know About Minerals?

Scientists have rules about what counts as a mineral. A mineral must be found in nature, be solid, and have a special pattern inside called a crystal structure. Minerals can form with help from tiny living things over a very long time.

Minerals are important for business too. Some minerals, called ores, have a lot of a certain element, usually a metal. For example, cinnabar is used to get mercury, and sphalerite is used to get zinc.

Learning About Minerals

We can tell minerals apart by looking at their properties. For example, we can look at their shape inside (crystal structure), how hard they are, how shiny they look, and if light can pass through them. We also look at their color, the color of powder they leave, how they break, and how heavy they feel for their size.

Minerals have been studied for a long time. In 315 BCE, Theophrastus described minerals in his book On Stones. Carl Linnaeus described minerals in his book Systema Naturae in 1735. Today, minerals are grouped by type, group, and family. The two main systems for classifying minerals are Dana and Strunz.

Silicates

The largest group of minerals are the silicates. Most rocks contain more than 95% silicate minerals, and over 90% of the Earth's crust is made of these minerals. Silicates have silicon and oxygen, and other common elements like aluminium, magnesium, iron, calcium, sodium, and potassium.

Silicates are divided into groups based on how their silicon-oxygen tetrahedra are linked together. The main groups are tectosilicates, phyllosilicates, inosilicates, cyclosilicates, sorosilicates, and orthosilicates.

Non-Silicates

Non-silicate minerals are also important. They include native elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and organic minerals. For example, oxide minerals include cuprite and corundum. Halide minerals include halite and fluorite. Carbonate minerals include calcite and aragonite. Sulfate minerals include gypsum and barite. Phosphate minerals include apatite and monazite.

Finding Life Beyond Earth

Scientists think special minerals made by living things, called biominerals, might help us find life beyond Earth. They could show if there was life on places like Mars. In 2014, NASA said robots named Curiosity and Opportunity were exploring Mars. They looked for very old signs of life, like tiny organisms, and for places that might have been good for life, like old river plains or lakes. This is important for NASA.