• A naturally occurring substance of inorganic origin.• Their molecular structures are regular and their chemical composition varies only within specific limits.• A natural solid substance found in the earth’s crust.• Substances that make up the rocks of Earth.• They are HOMOGENOUS – every part of it is the same as every other part.
PRINCIPAL GROUPS • Native Elements • Halides • Sulphides • Oxides • Carbonates • Sulphates • Phosphates • Silicates
USES• Sources of essential metals. – Ores: a natural occurring metallic compound from which the metal can be extended.• Used as catalysts or fluxes in chemical reactions.• Some are of aesthetic value as collectors’ items or jewelry stones.
PROPERTIES TO IDENTIFY A MINERAL • Crystal Shape • Luster –Metallic –Non-metallic • Color • Streak • Hardness
MINERALS THAT ARE PART OF A BALANCED DIET• Iron – essential constituent of hemoglobin• Calcium – for strong bones and teeth, and for muscle contraction• Sodium – (salt) for the nerve cells and to produce hydrochloric acid for digestion• Iodine – used to create thyroxine, hormone partly responsible for controlling metabolic rate in body
Minerals composed of organic matter (crude oil, coal) are not true minerals but are called minerals.