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Molybdophyllite

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Harstigen Mine, Pajsberg, Persberg district, Filipstad, Värmland, Sweden
© Ö. Österberg

Show Molybdophyllite Photos (3)



Formula:
Pb
 
2
Mg
 
2
Si
 
2
O
 
7
(OH)
 
2
System:TrigonalHardness:3 - 4
Name:From the Greek molybdos, for lead, and phyllos (φύλλον), for leaf, in allusion to its lead content and foliated habit.
This page provides mineralogical data about Molybdophyllite.

Classification of Molybdophyllite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/C.19-20
Nickel-Strunz 10th (pending) edition ID:9.HH.25

9 : SILICATES (Germanates)
H : Unclassified silicates
H : With Pb
Dana 8th edition ID:78.5.7.1

78 : Unclassified Silicates
5 :
Hey's CIM Ref.:14.13.4

14 : Silicates not Containing Aluminum
13 : Silicates of Pb
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Type Occurrence of Molybdophyllite

Type Locality:Långban, Filipstad, Värmland, Sweden
Year of Discovery:1901

Physical Properties of Molybdophyllite

Hardness (Mohs):3 - 4

Crystallography of Molybdophyllite

Crystal System:Trigonal

Optical Data of Molybdophyllite

Type:Uniaxial (-)
RI values: nω = 1.815 nε = 1.761
Maximum Birefringence:δ = 0.054

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Molybdophyllite

Formula:
Pb
 
2
Mg
 
2
Si
 
2
O
 
7
(OH)
 
2
Essential elements:H, Mg, O, Pb, Si
All elements listed in formula:H, Mg, O, Pb, Si
Common Impurities:Al,Na,K,H2O

Relationship of Molybdophyllite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.HH.05Macquartite
Pb
 
3
Cu(CrO
 
4
)(SiO
 
3
)(OH)
 
4
 · 2H
 
2
O
9.HH.10Luddenite
Cu
 
2
Pb
 
2
Si
 
5
O
 
14
 · 4H
 
2
O
9.HH.15Creaseyite
Cu
 
2
Pb
 
2
(Fe,Al)
 
2
Si
 
5
O
 
17
 · 6H
 
2
O
9.HH.20Plumbotsumite
Pb
 
13
(CO
 
3
)
 
6
(Si
 
10
O
 
27
) · 3H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
14.13.1Alamosite
Pb
 
12
[Si
 
12
O
 
36
]
14.13.2Plumbotsumite
Pb
 
13
(CO
 
3
)
 
6
(Si
 
10
O
 
27
) · 3H
 
2
O
14.13.3Luddenite
Cu
 
2
Pb
 
2
Si
 
5
O
 
14
 · 4H
 
2
O
14.13.5Margarosanite
Pb(Ca,Mn
2+
 
)
 
2
(Si
 
3
O
 
9
)
14.13.6Ganomalite
Pb
 
9
Ca
 
5
Mn(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)O
14.13.7Kentrolite
Pb
 
2
Mn
3+
2
(Si
 
2
O
 
7
)O
 
2
14.13.8Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
14.13.9Melanotekite
Pb
 
2
Fe
3+
2
(Si
 
2
O
 
7
)O
 
2
14.13.10Creaseyite
Cu
 
2
Pb
 
2
(Fe,Al)
 
2
Si
 
5
O
 
17
 · 6H
 
2
O

Other Names for Molybdophyllite

Other Languages:
German:Molybdophyllit
Simplified Chinese:硅镁铅矿
Spanish:Molybdophyllita

Other Information

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

References for Molybdophyllite

Reference List:

- +
American Mineralogist (1996): 81: 520.

Internet Links for Molybdophyllite

Search Engines:
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    • External Links:
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  • Look for Molybdophyllite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Molybdophyllite details from Handbook of Mineralogy (PDF)
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    • Localities for Molybdophyllite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjozondjupa Region
      • Grootfontein District
        • Kombat
    		Mineralogical Record: 22: 421.
    Sweden
     
    • 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.
        • Persberg district
          • Pajsberg
    		Nysten, P. (2004): Harstigen ett mineralogisk eldorado i Bergslagen. Norsk Bergverksmuseum Skrift 28: 5-13
    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.
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