Nature · Earth Science
The crystalline building blocks of the Earth
Minerals are the naturally occurring, crystalline building blocks from which all rocks are made — each with a definite chemical composition and an orderly atomic structure. From common quartz to dazzling diamonds, they store the story of how and where they grew, and the rarest and most beautiful become treasured gemstones.
Minerals crystallise wherever atoms lock into ordered structures: from cooling magma, from water evaporating or cooling in cracks, or from heat and pressure reshaping existing rock. Slow, undisturbed growth yields large, well-formed crystals; the exact conditions decide a mineral’s colour, hardness and form.
Mineral-rich fluids fill a cavity and crystals grow inward over time, forming a geode lined with glittering points.
The most abundant family on Earth
Silicates dominate the Earth’s crust, built from silicon and oxygen tetrahedra linked in chains, sheets and frameworks. Quartz and feldspar alone make up most of the rock beneath our feet.
Rare, hard and dazzling
A handful of minerals are rare, hard and beautiful enough to be treasured as precious gems. Diamonds form deep in the mantle; rubies and sapphires are gem-quality corundum coloured by trace elements.
The metals that built civilisation
Ore minerals hold metals in concentrations worth mining — iron from hematite, lead from galena, copper from sulphides. Hot fluids often concentrate them into rich veins.
Hidden crystal-lined hollows
A geode is an unremarkable-looking nodule that hides a cavity lined with inward-growing crystals. Mineral-rich water slowly deposits layer after glittering layer, sometimes as purple amethyst.