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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.
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 ...
Amethyst crystals – a purple quartz Apophyllite crystals sitting right beside a cluster of peachy bowtie stilbite Aquamarine variety of beryl with tourmaline on orthoclase Arsenopyrite from Hidalgo del Parral, Chihuahua, Mexico Aurichalcite needles spraying out within a protected pocket lined by bladed calcite crystals Austinite from the Ojuela Mine, Mapimí, Durango, Mexico Ametrine ...
Stibnite Realgar. The sulphide minerals are a class of minerals containing sulphide (S 2−) or disulphide (S 2− 2) as the major anion.Some sulfide minerals are economically important as metal ores.
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
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]
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.
Under this temperature any samples of 'argentite' convert to acanthite. The name argentite is therefore used (confusingly) by some to describe pseudo-cubic pseudomorphs of silver sulphide (acanthite) where the original crystal form of the high-temperature cubic argentite has remained.