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Litharge

Natural mineral form of lead(II) oxide

Summary

Natural mineral form of lead(II) oxide

Field	Value
name	Litharge
image	Litharge.jpg
category	Oxide minerals
formula	PbO
IMAsymbol	Lit
strunz	4.AC.20
system	Tetragonal
class	Ditetragonal dipyramidal (4/mmm)
H-M symbol: (4/m 2/m 2/m)
symmetry	P4/nmm
color	red
cleavage	Distinct/Good. On {110}
mohs	2
luster	greasy, dull
diaphaneity	transparent
references

H-M symbol: (4/m 2/m 2/m) | length fast/slow = Litharge (from Greek lithargyros, lithos 'stone' + argyros 'silver' {{Script|Greek|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 yellow 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 heating of other lead oxides in air. 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. :PbO2 –(293 °C)→ Pb12O19 –(351 °C)→ Pb12O17 –(375 °C)→ Pb3O4 –(605 °C)→ PbO

Historical terminology

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; and 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.

Litharge smelting

According to Probert, "silver ore, litharge (crude lead oxide) flux and charcoal were mixed and smelted in very small clay and stone furnaces. Resulting silver-bearing lead bullion was later refined in a second furnace which yielded fine silver, and litharge skimmings which were used again."

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Lindgrenite Mineralienatlas]
[http://www.mindat.org/min-2466.html Mindat]
[http://webmineral.com/data/Litharge.shtml Webmineral data]
N.N. Greenwood, A. Earnshaw, "Chemistry of Elements", 2nd edition, Butterworth-Heinemann, 1997.
"VI. Semivitrified Oxide of Lead - Oxide of Lead. - Plumbi Oxidum. Us. - Litiiargyrum. Br. - Litharge".
{{OED. litharge
Alan Probert, "Bartolomé de Medina: The Patio Process and the Sixteenth Century Silver Crisis" in Bakewell, Peter, ed. ''Mines of Silver and Gold in the Americas''. Variorum: Brookfield, 1997, pp. 96, {{ISBN. 0860785130.

Wikipedia Source

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