Mercurio
Mercurio is a mineral with formula Hg, in the Elementos Nativos group. This specimen comes from Mina de Almadén, Almadén, Ciudad Real, Castilla-La Mancha, España and joined the Terrium collection in 2025.
Description
Mercury poses a basic cataloguing issue: as a liquid metal, it does not admit "size" in centimetres in the way a crystallised or massive specimen does. In its case, besides weight, it is more useful to indicate volume. Applying V=m/ρ, this 15 g specimen occupies approximately 1.11 cm³.
History of this specimen
Pedro Pantaleón gave it to me, taken from his father's dental surgery. As a child he developed the habit of sneaking to the half-kilo jar, fascinated by a metal that was liquid at the same time, spilling its contents on the floor and playing with a material that seemed impossible—heavy, shiny and almost alive.
About Mercurio
Mercury, like gold, had an unusual dental life: it left the mine to end up in the teeth of millions of people. Mixed with silver, tin and copper, it yielded a material mouldable on placement and hard once set—cheap, durable and widely used for generations. Seen from today, it sums up an era in which technical efficacy and toxicity coexisted with little friction.
About the locality
Almadén contains the largest mass of mercury on the planet, mostly as cinnabar—crystallised and red. In some galleries and damp faces the metal could also be seen in the liquid state, pooled in small pockets or impregnating fissures—exceptional among native elements. That direct, visible and manipulable presence of the metal marked mining at Almadén and helps explain its early exploitation: it was not only abundant, it was also physically accessible and recognisable. The mining district, now closed, forms part of the UNESCO World Heritage, together with its sister mine Idrija.
Technical data
- Catalogue No.
- 0390
- Composition
- Hg
- Name
- Mercurio
- Group
- Elementos Nativos
- Category
- Meritum Persé
- Mine
- Mina de Almadén
- District / Municipality
- Almadén
- Province
- Ciudad Real
- Region
- Castilla-La Mancha
- Country
- España
- Weight
- 15 g
- Acquired
- 2025
- Etymology
- From Latin hydrargyrum (from Greek hydrargyros), meaning "liquid silver".
- Quality
- Buena
- Value trend
- Estable
Related specimens
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- Abernathyita — España
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- Analcima — España
- Analcima — España