Minerals and Rock Formation
Ever wondered what makes up the rocks beneath your feet? Minerals are naturally occurring inorganic solids with orderly crystalline structures and specific chemical compositions. You can identify minerals by examining their color, streak (powder appearance), luster (shininess), crystal form, hardness, cleavage (how they split), fracture pattern, and density.
Earth consists of three primary layers: the relatively thin crust where we live, the mantle beneath it, and the extremely hot, high-pressure iron-rich core at the center. Minerals form through several processes including crystallization from cooling magma or lava, precipitation from evaporating solutions, changes in pressure and temperature, and even biological processes.
Rocks are naturally occurring masses of minerals that come in three main types. Igneous rocks like granite form when molten material cools and solidifies. Sedimentary rocks like limestone develop when layers of material settle and compress over time. Metamorphic rocks like soapstone result when existing rocks transform under heat and pressure.
💡 The Mohs scale ranks mineral hardness from 1-10, with diamonds at 10 being the hardest natural substance on Earth—hard enough to scratch glass!
