By Chisom Ibemere
Cerussite is an important ore of lead which comprises of lead carbonate. The word is derived from the latin “cerussa” which means white lead. It exhibits isomorphism with Aragonite and frequently twinned with a pseudo-hexagonal crystal form. It is given the name in 1845 by Wilhelm Karl. It belongs to Aragonite group.
Cerussite crystal occurs frequently with bright smooth faces. They are also seen in compact granular or fibrous forms. It is mostly colourless and may have grey-greenish colour and is transparent or translucent with an adamantine lustre.
Cerussite is brittle with a mohs hardness of 3-3.75 and specific gravity of 6.5. It gives off effervescence in dilute nitric acid. It is abundant with lead content of about 77.5%.
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Cerussite is globally distributed in places like Germany, Namibia, Morocco, USA, Australia etc. It occurs in oxidized zone of lead deposits as an important ore. It has association with minerals such as Anglesite, Pyromorphite, Malachite, Azurite, Galena.
Cerussite may form any of the fascinating and different crystals groups in the mineral kingdoms. It may be flat, thin, small, prismatic and tabular crystals. Crystals may come together to produce a beautiful shape such a star, sixlings, heart or v-shaped twin. The faces of the crystals are striated.
Cerussite is well known commercially as the secondary source of lead metal and are incorporated and used in making paints, plumbing, alloys as well as in cosmetics.
Cerussite is abundant in nature and used in making gemstone. It is difficult to cut as it requires great skills, expertise and care. Faceted crystals are basically rare. They can make beautiful rarities, natural crystals and fascinating specimen.
