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Molybdophyllite

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About MolybdophylliteHide

Formula:
Pb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O
Originally assumed to be "Pb2Mg2Si2O7(OH)2."
Colour:
colourless, pale grey, pale yellow, very pale green
Lustre:
Pearly
Hardness:
3 - 4
Specific Gravity:
4.652 (Calculated)
Crystal System:
Monoclinic
Name:
From the Greek molybdos, for lead, and phyllos (φύλλον), for leaf, in allusion to its lead content and foliated habit.
Molybdophyllite has an OD (order-disorder) structure. A trigonal and a monoclinic polytype have been derived by the OD approach. The crystal structure of the latter (C2) has been determined.

Closely related to britvinite.


Classification of MolybdophylliteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.HH.25

9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
78.5.7.1

78 : Unclassified Silicates
5 :
14.13.4

14 : Silicates not Containing Aluminum
13 : Silicates of Pb

Physical Properties of MolybdophylliteHide

Pearly
Transparency:
Transparent, Translucent
Colour:
colourless, pale grey, pale yellow, very pale green
Streak:
white
Hardness:
3 - 4 on Mohs scale
Cleavage:
Perfect
Parallel to the pseudohexagonal (0001) plane.
Fracture:
Irregular/Uneven
Density:
4.652 g/cm3 (Calculated)

Optical Data of MolybdophylliteHide

Type:
Biaxial (-)
Comments:
Pseudouniaxial (-) optics: ω = 1.815, ε = 1.761.

Chemical Properties of MolybdophylliteHide

Formula:
Pb8Mg9[Si10O28(OH)8|O2|(CO3)3] · H2O

Originally assumed to be "Pb2Mg2Si2O7(OH)2."
IMA Formula:
Pb8Mg9[Si10O28(OH)8O2(CO3)3] · H2O
Common Impurities:
Al,Na,K,H2O

Crystallography of MolybdophylliteHide

Crystal System:
Monoclinic
Class (H-M):
2 - Sphenoidal
Space Group:
B2
Setting:
C2
Cell Parameters:
a = 16.232(6) Å, b = 9.373(2) Å, c = 14.060(3) Å
β = 97.36°
Ratio:
a:b:c = 1.732 : 1 : 1.5
Unit Cell V:
2121.5 ų
Z:
2
Morphology:
Platy aggregates, embedded in matrix.
Comment:
Pseudohexagonal.

Type Occurrence of MolybdophylliteHide

Other Language Names for MolybdophylliteHide

Simplified Chinese:硅镁铅矿

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hausmannite1 photo of Molybdophyllite associated with Hausmannite on mindat.org.
Pinakiolite1 photo of Molybdophyllite associated with Pinakiolite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.HH.05MacquartiteCu2Pb7(CrO4)4(SiO4)2(OH)2Mon.
9.HH.10LuddeniteCu2Pb2Si5O14 · 4H2OMon.
9.HH.15CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm
9.HH.20PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.13.1AlamositePbSiO3Mon.
14.13.2PlumbotsumitePb13(CO3)6(Si10O27) · 3H2OOrth.
14.13.3LuddeniteCu2Pb2Si5O14 · 4H2OMon.
14.13.5MargarosanitePb(Ca,Mn2+)2(Si3O9)Tric. 1 : P1
14.13.6GanomalitePb9Ca5Mn(Si2O7)4(SiO4)OHex.
14.13.7KentrolitePb2Mn3+2(Si2O7)O2Orth. mmm (2/m 2/m 2/m) : Pbcm
14.13.8BarysilitePb8Mn2+[Si2O7]3Trig.
14.13.9MelanotekitePb2Fe3+2(Si2O7)O2Orth.
14.13.10CreaseyitePb2Cu2Fe3+2(Si4.67Al0.33)O15.33(OH)3 · H2OOrth. mmm (2/m 2/m 2/m) : Cmcm

Other InformationHide

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 MolybdophylliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Flink, G. (1901): Mineralogische Notizen. Bulletin of the Geological Institution of the University of Uppsala, 5, 81-96.
Aminoff, G. (1918): Röntgenographische Ermittelung der Symmetrie und des Elementes p0 des Molybdophyllits. Geologiska Föreningens i Stockholm Förhandlingar, 40, 923-938.
Charalampides, G. and Lindqvist, B. (1988): Ganomalite, margarosanite and molybdophyllite from Långban, south-central Sweden, and synthetic equivalents. Meddelanden från Stockholms Universitets Geologiska Institution, 273, IV/1-IV/24.
Charalampides, G. (1994): Mineralogical and crystal-chemical data of the lead silicate species ganomalite, margarosanite, and molybdophyllite from Långban, south-central Sweden and their synthetic equivalents. Oryktos Ploutos, 91, 33-46.
American Mineralogist (1996): 81: 520.
U. Kolitsch, S. Merlino and D. Holtstam (2012): Molybdophyllite: crystal chemistry, crystal structure, OD character and modular relationships with britvinite. Mineral. Mag. 76, 493-516.

Internet Links for MolybdophylliteHide

Localities for MolybdophylliteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Namibia
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
Dunn, P.J. (1991), Rare minerals of the Kombat Mine, Mineralogical Record: 22(6): 421-425.
Sweden (TL)
 
  • Värmland
    • Filipstad
GFF (1918) 40, 923-938; Nysten, P., Holtstam, D. and Jonsson, E. (1999) The Långban minerals. In Långban - The mines,their minerals, geology and explorers (D. Holtstam and J. Langhof, eds.), Swedish Museum of Natural History and Raster Förlag, Stockholm & Chr. Weise Verlag, Munich, pp. 89-183; U. Kolitsch, S. Merlino and D. Holtstam (2012): Molybdophyllite: crystal chemistry, crystal structure, OD character and modular relationships with britvinite. Mineralogical Magazine 76, 493-516.
      • Persberg district
        • Pajsberg
Jonsson, E. & Holtstam, D. (1998): En sahlinit-molybdofyllitassociation från Harstigen. Långbansnytt. vol 12 [reprinted in: Långbansnytt. De första 20 åren 1983-2003. Långbansällskapet - Skrifter och rapporter. 2, 114-115]; U. Kolitsch, S. Merlino and D. Holtstam (2012): Molybdophyllite: crystal chemistry, crystal structure, OD character and modular relationships with britvinite. Mineralogical Magazine 76, 493-516.
UK
 
  • England
    • Somerset
      • Cranmore
Turner, R.W. and Rumsey, M.S. (2010): Mineral Relationships in the Mendip Hills. Journal of the Russell Society, vol 13, pp 3-46.
Mineral and/or Locality  
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