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Orpiment

Each of these elements occurs naturally as a sulphide ore arsenic as realgar As S,, orpiment As, Sg and arsenical pyrites with approximate formula FeAsS antimony as stibnite Sb2S3 and bismuth as B12S3. [Pg.209]

Oldhamite, see Calcium sulfide Opal, see Silicon dioxide Orpiment, see Arsenic trisulfide Oxygen powder, see Sodium peroxide... [Pg.274]

Arsenik, m. n, arsenic, — gelber —, orpiment. — roter —, realgar. — weisser —, white arsenic, arsenic trioxide,... [Pg.34]

Rausch-gelb, n. orpiment. -gift, n. narcotic poison or drug, -gold, n. Dutch gold, tinsel, -leder, n. chamois (leather), -mittel, n. intoxicant. -rot, n. realgar, -silber, n. imitation silver foil. [Pg.358]

Sulfide minerals and K. Sulfides are among the least soluble ionic compounds. Their AQ, values are often smaller than 10-25. For this reason, many sulfides are found as minerals, for example (clockwise from the left), iron pyrite (FeS2), yellow orpiment (AS2S3). and black galena (PbS). [Pg.435]

FIGURE 15.3 The minerals (from left to right) orpiment, As2S, stibnite, Sb,S, and realgar, As4S4 are all ores that have been used as sources of Group 15A elements. [Pg.746]

Orpiment is As,5, and realgar is As4S4. Orpiment is yellow and realgar is orange-red. They are both used as... [Pg.1014]

Osorezan coloradoile, krennerite marcasite, pyrite, orpiment, realgar quartz, barite... [Pg.164]

Dominant sulfides and sulfate minerals in the Osorezan area are pyrite, marcasite, orpiment, realgar, stibnite, krennerite, coloradoite, jordanite, wurtzite, sphalerite, cinnabar, and barite (Aoki, 1992b). H2S concentration of the Osorezan hot spring is very high, compared with the other Japanese geothermal waters (Table 2.4). [Pg.312]

Several types of mineralizations, massive-type stockwork mineralization and a sulfide-bearing sediment layer were described (Halbach et al., 1989). The outer portion of the massive sulfide sample (late-stage) is composed of barite, realgar, orpiment, amorphous silica and hydrous Fe-Mn oxides, small amounts of sphalerite, galena and pyrite. The central portion consists mainly of sphalerite, pyrite and galena with small... [Pg.333]

Although mineralogy is different in different site, the more abundant minerals in back-arc deposits than in midoceanic ridge deposits are barite, anhydrite, electrum, As-minerals (realgar, orpiment), tetrahedrite-tennantite and galena. [Pg.361]

An experimental study at 350°C on the interaction between NaCl solution and graywacke which occurs widely in island arc geologic setting indicates that the final solution contains (0.6-0.7) ppm As (Bischoff et al., 1981). Analytical data on As concentration of hydrothermal solution at back-arc basins are few. Arsenic concentration of hydrothermal solution at Lau Basin is 6.0-8.2 ppm (Foquet et al., 1991). We can also estimate As concentration of hydrothermal solution based on the solubility data on orpiment and realgar because these As-bearing minerals are common in back-arc basin deposits (e.g., Okinawa Trough, Kuroko deposits). [Pg.421]

Orpiment, Deterioration of Arsenic Sulfide Pigments. Arie Wallert, Molecular Aspects of Ageing in Painted Works of Art, Progress Report 1995-1997, FOM Institute for Atomic and Molecular Physics, Amsterdam, NL, http //www.amolf.nl/research/biomacro molecular mass spectrometry/molart/progress report98.pdf... [Pg.58]

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