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Massicot

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Formula:
PbO
System:
Orthorhombic
Colour:
Sulphur- to ...
Hardness:
2
Name:
Derived from early arabic, through spanish mazacote and the French name for oxide of lead.
Dimorph of:
This page provides mineralogical data about Massicot.

Classification of Massicot

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.AC.25

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
A : Metal: Oxygen = 2:1 and 1:1
C : M:O = 1:1 (and up to 1:1.25); with large cations (+- smaller ones)
4.2.7.1

4 : SIMPLE OXIDES
2 : AX
7.11.20

7 : Oxides and Hydroxides
11 : Oxides of Sn and Pb
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First Recorded Occurrence of Massicot

Year of Discovery:
1841

Occurrences of Massicot

Geological Setting:
As an alteration product of lead minerals.

Physical Properties of Massicot

Greasy, Dull
Colour:
Sulphur- to orpiment-yellow, sometimes with a reddish tint. Nearly colourless to pale yellow in transmitted light.
Streak:
Yellow
Hardness (Mohs):
2
Density:
9.56 g/cm3 (Measured)    9.64 g/cm3 (Calculated)

Crystallography of Massicot

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Cmmm
Cell Parameters:
a = 5.4903(1) Å, b = 5.892Å, c = 4.752Å
Ratio:
a:b:c = 0.932 : 1 : 0.807
Unit Cell Volume:
V 153.72 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Massive, earthy to scaly. Artificial crystals are tabular {100}.
Twinning:
Observed on artificial crystals.
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.068 (100)
2.946 (24)
2.745 (23)
2.3767 (17)
2.0078 (13)
1.7232 (16)
1.6401 (15)

Optical Data of Massicot

Type:
Biaxial (+)
RI values:
nα = 2.510 nβ = 2.610 nγ = 2.710
2V:
Measured: 90° , Calculated: 86°
Max Birefringence:
δ = 0.200
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
Strong
Pleochroism:
Visible
Comments:
Y = light sulfur yellow
Z = deep yellow

Chemical Properties of Massicot

Formula:
PbO
Essential elements:
All elements listed in formula:

Relationship of Massicot to other Species

4.AC.05SwedenborgiteNaBe4Sb5+O7
4.AC.10BrownmilleriteCa2(Al,Fe3+)2O5
4.AC.10SrebrodolskiteCa2Fe23+O5
4.AC.15MontroyditeHgO
4.AC.20LithargePbO
4.AC.20RomarchiteSnO
7.11.1RomarchiteSnO
7.11.2CassiteriteSnO2
7.11.4SchoenfliesiteMg[Sn(OH)6]
7.11.5BurtiteCa[Sn(OH)6]
7.11.6VismirnoviteZn[Sn(OH)6]
7.11.7WickmaniteMn2+[Sn(OH)6]
7.11.8TetrawickmaniteMn2+[Sn4+(OH)6]
7.11.9Jeanbandyite(Fe2+,Mn2+)[Sn4+(OH)6]
7.11.10NataniteFe2+[Sn(OH)6]
7.11.11Mushistonite(Cu,Zn,Fe2+)[Sn(OH)6]
7.11.12Ferronigerite-2N1S(Al,Fe,Zn)2(Al,Sn)6O11(OH)
7.11.13Magnesionigerite
7.11.14ArgutiteGeO2
7.11.15BrunogeieriteFe22+Ge4+O4
7.11.16StottiteFe2+[Ge4+(OH)6]
7.11.17CarboiriteFeAl2(GeO4)O(OH)2
7.11.18OtjisumeitePbGe4O9
7.11.19BartelkeitePb(Fe2+Ge)[Ge2O7](OH)2 · H2O
7.11.21LithargePbO
7.11.22MiniumPb3O4
7.11.23PlattneritePbO2
7.11.24Scrutinyitealpha-PbO2
7.11.25MurdochitePbCu6O8-x(Cl,Br)2x where x<=0.5
7.11.26MacedonitePbTiO3
7.11.27CesàrolitePb(Mn4+)3O6(OH)2
7.11.28CoronaditePb(Mn64+Mn23+)O16
7.11.29QuenselitePbMnO2(OH)
7.11.30PlumboferritePb2Fe3+11-xMnx2+O19-2x, x = 1/3
7.11.31Magnetoplumbite(Pb,Mn)(Fe,Mn)12O19
7.11.32SenaitePb(Ti,Fe,Mn)21O38

Other Names for Massicot

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Massicot

Reference List:
Huot (1841): 346.

Weisbach (1875): 54.

D'Achiardi (1883): 1: 221.

Larsen, E.S. (1917), Massicot and litharge, the two modifications of lead monoxide: American Mineralogist: 2: 18-19.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 516-517.

Acta Crystallographica (1985): C41: 1281-1284.

Internet Links for Massicot

Localities for Massicot

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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