Litharge

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Litharge
Kristallstruktur Blei(II)-oxid.png
Litharge structure
General
Category Oxide minerals
Formula
(repeating unit)
PbO
Strunz classification 4.AC.20
Crystal system Tetragonal
Ditetragonal dipyramidal class
Identification
Color red
Crystal symmetry Tetragonal
H-M symbol: (4/m 2/m 2/m)
Space group: P4/nmm
Cleavage Distinct/Good. On {110}
Mohs scale hardness 2
Luster greasy, dull
Diaphaneity transparent
References [1][2][3]

Litharge (from Greek lithargyros, lithos (stone) + argyros (silver) λιθάργυρος) is one of the natural mineral forms of lead(II) oxide, PbO. Litharge is a secondary mineral which forms from the oxidation of galena ores. It forms as coatings and encrustations with internal tetragonal crystal structure. It is dimorphous with the orthorhombic form massicot. It forms soft (Mohs hardness of 2), red, greasy-appearing crusts with a very high specific gravity of 9.14–9.35. PbO may be prepared by heating lead metal in air at approximately 600°C (lead melts at only 300°C). At this temperature it is also the end product of oxidation of other lead oxides in air.[4] This is often done with a set of bellows pumping air over molten lead and causing the oxidized product to slip or fall off the top into a receptacle, where it quickly solidifies in minute scales.[5]

PbO2 –(293 °C)→ Pb12O19 –(351 °C)→ Pb12O17 –(375 °C)→ Pb3O4 –(605 °C)→ PbO

Historical terminology[edit]

Historically, the term "litharge" has been combined to refer to other similar substances. For example, litharge of gold is litharge mixed with red lead, giving it a red color; litharge of bismuth is a similar result of the oxidation of bismuth; litharge of silver is litharge that comes as a by-product of separating silver from lead, in fact litharge originally meant the mineral residue from silver refining. The term has also been used as a synonym for white lead or red lead.[6]

References[edit]

  • Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, 514–515
  • Mineral Data Publishing (PDF)