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Argentite sample The unit cell of argentite. In mineralogy, argentite (from Latin argentum ' silver') is cubic silver sulfide (Ag 2 S), which can only exist at temperatures above 173 °C (343 °F), [1] 177 °C (351 °F), [2] or 179 °C (354 °F). [3] When it cools to ordinary temperatures it turns into its monoclinic polymorph, acanthite.
Argentite is the stable form above that temperature. As argentite cools below that temperature its cubic form is distorted to the monoclinic form of acanthite. Below 173 °C acanthite forms directly. [3] [6] Acanthite is the only stable form in normal air temperature.
A photograph of silver ore. Silver-bearing ore typically contains very little silver, with much higher percentages of copper and lead. Specific minerals include argentite (Ag 2 S), chlorargyrite ("horn silver," AgCl), polybasite (Ag, Cu) 16 Sb 2 S 11), and proustite (Ag 3 AsS 3). [2]
Argentite, silver sulfide of the orthorhombic system, one of the oldest silver ore minerals. In addition, there are several more mixed minerals, part of the name of which is also silver glance: Antimony-silver glance (German: Antimonsilberglanz) — Stephanite; Black silver glance (German: Schwarzsilberglanz) — Stephanite
Cubic crystals of argentite transformed into acanthite (monoclinic), without any external visible change. Specimen from the San Juan de Rayas Mine, Guanajuato, Mexico. 3 cm. A paramorph (also called allomorph) is a mineral changed on the molecular level only when the structure of a mineral transitions to a more stable polymorph. It has the same ...
Silver sulfide is an inorganic compound with the formula Ag 2 S.A dense black solid, it is the only sulfide of silver.It is useful as a photosensitizer in photography.It constitutes the tarnish that forms over time on silverware and other silver objects.
Acanthite var. argentite (a pseudomorph after argentite) and β-quartz pseudomorphs are sometimes sold. [31] Ramdohr (1936) discovered that the type material of schapbachite (Ag 0.4 Pb 0.2 Bi 0.4 S) was a mixture of galena (PbS) and matildite (AgBiS 2). [32] It was discredited (1982) as it was found unstable at 'standard temperature and ...
Silver is found in the Earth's crust in the pure, free elemental form ("native silver"), as an alloy with gold and other metals, and in minerals such as argentite and chlorargyrite. Most silver is produced as a byproduct of copper, gold, lead, and zinc refining. Silver is a naturally occurring element.