Native Mineral
Native element minerals are among the most fascinating because they consist of a single chemical element (or a natural alloy) rather than a compound of elements. Think of pure gold (Au), silver (Ag), copper (Cu), sulfur (S), carbon as diamond or graphite — each stands alone, uncombined with other elements, yet forms a crystalline mineral with its own story. Because they don’t require the bonding of multiple elements, they often appear in unique settings: gold and silver in hydrothermal veins or placer deposits, native copper in mafic volcanic flows, sulfur around volcanic fumaroles, diamond from deep mantle pipes and graphite in metamorphosed sediments. These minerals carry not only geological significance — they record conditions like temperature, fluid flow, redox state and deposition environment — but also strong engineering, economic and material-science importance: native copper for conductivity, gold and silver for value and technology, carbon in its diamond form for hardness, graphite for lubrication and electrodes. In this category you’ll explore how single-element minerals form, where they’re found, how to recognise them in the field or core, and why they still matter in exploration, geotechnics and industry.
Graphite
Graphite is like diamond, graphite is a form of native carbon crystalline with its atoms arranged in a hexagonal structure. Graphite is opaque and dark gray to black. It occurs as hexagonal crystals, flexible sheets, scales, or large masses.
Diamond
The hardest known mineral, diamond is pure carbon. Its crystals typically occur as octahedrons and cubes with rounded edges and slightly convex faces. Crystals may be transparent, translucent, or opaque. They range from colorless to black, with brown and yellow being the most common colors. Other forms include bort or boart (irregular or granular black diamond) and carbonado (microcrystalline masses).
Antimony
Antimony usually occurs in massive, leafy or granular form. It has a flaky texture that makes it shiny, silvery, bluish white and brittle. It occurs in rare, usually massive, leafy or granular form.
Arsenic
Arsenic is a native element with the formula As and atomic number 33. Known since antiquity, arsenic is widely distributed in nature, although it is unusual in native form. It is classified as a semimetal, because it possesses some properties of metals and some of nonmetals. Crystals are rare, but when found they are rhombohedral.
Iron
Five percent of Earth’s crust is made up of iron. Native iron is rare in the crust and is invariably alloyed with nickel. Low-nickel iron (up to 7.5 percent nickel) is called kamacite, and high-nickel iron (up to 50 percent nickel) is called taenite. Both crystallize in the cubic system. A third form of iron-nickel, mainly found in meteorites and crystallizing in the tetragonal system, is called tetrataenite. All three forms are generally found either as disseminated grains or as rounded masses. Kamacite is the major component of most iron meteorites. It is found in most chondritic meteorites, and occurs as microscopic grains in some lunar rocks. Taenite and tetrataenite are mainly found in meteorites, often intergrown with kamacite. Iron is also plentiful in the Sun and other stars.
Bismuth
As a native metal, bismuth has been known since the Middle Ages. A German monk named Basil Valentine first described it in 1450. Bismuth is often found uncombined with other elements, forming indistinct crystals, often in parallel groupings. It is hard, brittle, and lustrous. It is also found in grains and as foliated masses. Silver-white, it usually has a reddish tinge that distinguishes it. Specimens may have an iridescent tarnish. Bismuth is found in hydrothermal veins and in pegmatites and is often associated with ores of tin, lead, or copper,
