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Molybdophyllite

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

Formula:
Pb
 
2
Mg
 
2
[(OH)
 
2
|Si
 
2
O
 
7
]
System:TrigonalHardness:3 - 4
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
[(OH)
 
2
|Si
 
2
O
 
7
]
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
 
5
Si
 
4
O
 
8
(OH)
 
10
Related Minerals - Hey's Index Grouping:

- +
14.13.1Alamosite
Pb
 
12
[Si
 
12
O
 
36
]
14.13.2Plumbotsumite
Pb
 
5
Si
 
4
O
 
8
(OH)
 
10
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[O|SiO
 
4
|(Si
 
2
O
 
7
)
 
4
]
14.13.7Kentrolite
Pb
 
2
Mn
3+
2
[O
 
2
|Si
 
2
O
 
7
]
14.13.8Barysilite
Pb
 
8
Mn
2+
 
[Si
 
2
O
 
7
]
 
3
14.13.9Melanotekite
Pb
 
2
Fe
3+
2
[O
 
2
|Si
 
2
O
 
7
]
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
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.

Articles/Blogs about Molybdophyllite

Internet Links for Molybdophyllite

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  • Raman and XRD data at RRUFF project
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    Localities for Molybdophyllite

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    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.
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    (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.
        • Pajsberg
    		No reference listed
    Mineral and/or Locality
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