Search results
Results from the WOW.Com Content Network
Orpiment and realgar are closely related minerals and are often categorized in the same group. They are both arsenic sulfides and belong to the monoclinic crystal system. They are found in the same deposits and can form in the same geologic environments. As a result, Orpiment and realgar share similar physical properties and histories of use by ...
Realgar (/ r i ˈ æ l ɡ ɑːr,-ɡ ər / ree-AL-gar, -gər), also known as arsenic blende, ruby sulphur or ruby of arsenic, is an arsenic sulfide mineral with the chemical formula α-As 4 S 4. It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related ...
Arsenic blende or Arsenblende (German: Arsenblende, arsenik-blende) is a trivial name that has partially fallen out of scientific use, used by mineralogists, as well as representatives of mining and craft professions in relation to at least two similar ore minerals — orpiment and realgar, [1]: 135, 239, 438 in composition — arsenic sulfides.
Arsenic trisulfide is the inorganic compound with the formula As 2 S 3.It is a dark yellow solid that is insoluble in water. It also occurs as the mineral orpiment (Latin: auripigmentum), which has been used as a pigment called King's yellow.
Both orpiment and realgar, as well as As 4 S 3, have selenium analogs; the analogous As 2 Te 3 is known as the mineral kalgoorlieite, [7] and the anion As 2 Te − is known as a ligand in cobalt complexes. [8] All trihalides of arsenic(III) are well known except the astatide, which is unknown.
The most common minerals in ore-bearing associations of volcanogenic massive sulfide deposits (non-metamorphosed or oxidized) and their modern analogues are pyrite, pyrrhotite, chalcopyrite, covellite, sphalerite, galena, tetrahedrite-tennantite, marcasite, realgar, orpiment, proustite-pyrargyrite, wurtzite, stannite , Mn oxides, cassiterite ...
Arsenic trisulfide, As 2 S 3, the mineral orpiment; Arsenic pentasulfide, As 2 S 5, similar structure to phosphorus pentasulfide (β-P 2 S 5) Tetraarsenic tetrasulfide, As 4 S 4 (2 isomers): the mineral realgar; the mineral pararealgar; Tetraarsenic trisulfide, As 4 S 3, the mineral α- or β- dimorphite
Realgar: As 4 S 4 - a highly toxic natural pigment. Cadmium pigments. Cadmium red (PR108): cadmium sulfo-selenide (Cd2SSe). Cerium pigments. Cerium sulfide red (PR265). Iron oxide pigments. Sanguine, Caput mortuum, Indian red, Venetian red, oxide red (PR102). Red ochre (PR102): anhydrous Fe 2 O 3. Burnt sienna (PBr7): a pigment produced by ...