What defines a mineral?
A mineral must meet these criteria:
1. Naturally occurring: It must be found in nature, not created artificially.
2. Inorganic: It must not be derived from living organisms.
3. Solid: It must be in a solid state at room temperature.
4. Definite chemical composition: It has a specific chemical formula, even if there's some variation within that formula.
5. Ordered internal structure: Its atoms are arranged in a specific, repeating pattern, creating a crystal lattice.
Why brick, steel, and glass don't qualify:
* Brick: Brick is made by heating clay and other materials (often containing minerals) to high temperatures, causing them to fuse and harden. This process changes the original composition and structure of the materials, so it doesn't fit the definition of a naturally occurring, solid with a defined chemical composition.
* Steel: Steel is an alloy, a mixture of iron and other elements (usually carbon) that is produced through a complex process. This process involves melting and mixing, creating a substance with no specific crystalline structure. It's also not naturally occurring in this form.
* Glass: Glass is a non-crystalline solid (amorphous) made by melting silica sand (a mineral), soda ash, and other ingredients. The process of melting and cooling transforms the raw materials into a new substance with no definite chemical composition or crystal structure. It's also not naturally occurring in this form.
In summary:
While the components of brick, steel, and glass come from the Earth's crust, the processes that create these materials fundamentally alter their composition and structure. They no longer meet the criteria to be classified as minerals.
