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of 9.64. Massicot can be found as a natural mineral, though it is only found in minor quantities. In bygone centuries it was mined. Nowadays massicot arises during industrial processing of lead and lead oxides, especially in the glass industry, which is the biggest user of PbO.
532:, by David John Rowe, year 1983, page 16. The word is in Italian and French in the late medieval era meaning naturally occurring massicot and in some records more vaguely a lead-based ceramics glaze that may or may not have been massicot.
350:
The definition of massicot as orthorhombic PbO dates from the 1840s, but the substance massicot and the name massicot has been in use since the late medieval era. There is some evidence that the ancient Romans used the substance.
370:, either naturally or in industrial processing. When massicot is found in a natural environment, some other minerals that may be found with it may include
602:
338:. PbO can be changed from massicot to litharge (or vice versa) by controlled heating and cooling. At room temperature massicot forms soft (
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Some comments about the evolution of the definition of the word massicot over the past few centuries is in
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Massicot from the Monte Cristo mine, Goodsprings
District, Clark County, Nevada (size: 5.0 x 4.0 x 4.0 cm)
588:
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Palache, C., H. Berman, and C. Frondel (1944) Dana’s system of mineralogy, (7th edition), v. I, 516–517
546:, by George Robert Rapp, year 2002, page 173, says three lead oxides were known to the ancient Romans:
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517:, published by Kluwer Academic Publishers, year 2002, section 9.4 on lead alkoxides, page 115.
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of 2) yellow to reddish-yellow, earthy, scaley masses which are very dense, with a
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326:. Lead(II) oxide (formula: PbO) can occur in one of two lattice formats,
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511:, by Anil Kumar De, year 2007, page 383. A more complex example is in
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358:product of other lead-bearing minerals such as
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529:Lead Manufacturing in Britain: A History
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279:Y = light sulfur-yellow; Z = deep yellow
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131:a = 5.4903 Å, b = 5.892 Å,
562:
409:"IMA–CNMNC approved mineral symbols"
406:
334:. The red tetragonal form is called
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508:A Text Book of Inorganic Chemistry
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14:
658:
133:c = 4.752 Å; Z = 4
514:The Chemistry of Metal Alkoxides
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156:Scaly as incrustations, massive
567:This article about a specific
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324:orthorhombic lattice structure
289:Measured: 90°, calculated: 86°
1:
505:A simple example is given in
470:Mineral data publishing - PDF
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575:. You can help Knowledge by
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166:Distinct on {100} and {010}
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642:Minerals in space group 57
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146:Yellow may have a red tint
550:, litharge, and massicot.
495:Mindat with location data
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413:Mineralogical Magazine
637:Orthorhombic minerals
632:Alchemical substances
78:Strunz classification
647:Oxide mineral stubs
434:10.1180/mgm.2021.43
425:2021MinM...85..291W
407:Warr, L.N. (2021).
354:It may occur as an
234:Optical properties
104:Dipyramidal (mmm)
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543:Archaeomineralogy
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344:specific gravity
243:Refractive index
229:9.642 calculated
225:Specific gravity
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56:(repeating unit)
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109:: (2/m 2/m 2/m)
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199:Greasy to dull
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138:Identification
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88:Crystal system
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627:Lead minerals
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569:oxide mineral
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340:Mohs hardness
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320:oxide mineral
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265:Birefringence
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100:Crystal class
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577:expanding it
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374:, litharge,
368:boulangerite
353:
349:
328:orthorhombic
312:
311:
119:
93:Orthorhombic
384:valentinite
275:Pleochroism
237:Biaxial (+)
219:Translucent
215:Diaphaneity
115:Space group
616:Categories
394:References
364:bournonite
332:tetragonal
304:References
295:Dispersion
182:Mohs scale
107:H-M symbol
68:IMA symbol
443:235729616
380:wulfenite
372:cerussite
356:oxidation
317:lead (II)
269:δ = 0.200
255:= 2.610 n
251:= 2.510 n
127:Unit cell
388:limonite
336:litharge
322:with an
313:Massicot
285:2V angle
185:hardness
176:Flexible
172:Fracture
162:Cleavage
41:Category
19:Massicot
421:Bibcode
259:= 2.710
82:4.AC.25
52:Formula
36:General
548:minium
441:
376:minium
360:galena
299:Strong
209:Yellow
205:Streak
195:Luster
571:is a
439:S2CID
143:Color
573:stub
386:and
330:and
120:Pbcm
429:doi
315:is
72:Msi
61:PbO
618::
487:^
462:^
437:.
427:.
417:85
415:.
411:.
390:.
382:,
378:,
366:,
362:,
604:e
597:t
590:v
579:.
445:.
431::
423::
257:γ
253:β
249:α
247:n
189:2
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