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The formal definition of a mineral has five parts. A mineral is naturally occurring, inorganic, a solid, has a definite

Walk a mineral show and you will hear dealers sorting their stock by words rather than measurements: thumbnails in this

The Moon is made of the same material as Earth, formed at the same time, from the same collision. It

Minerals are among the harder subjects in photography. They are highly reflective, strongly three-dimensional, frequently translucent, and often small enough

Most of what is sold in a rock shop is inert and safe to handle. Quartz, feldspar, calcite, mica, garnet,

Two cavities in the same rock, filled by the same fluid, at the same time. One produces a single quartz

Two minerals sitting on the same specimen is ordinary. Two minerals sitting on the same specimen where every crystal of

Ask what the most abundant mineral on Earth is and the reasonable answer is feldspar, which makes up around 60

Sulfide ore bodies do not sit quietly at the surface. When groundwater carrying dissolved oxygen reaches them, sulfides oxidise, metals

Experienced field collectors do something that looks vandalistic to beginners. They pick up a promising rock and immediately hit it