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Plumbophyllite

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Blue Bell claims (Hard Luck claims), Baker, San Bernardino Co., California, USA

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Formula:
Pb
 
2
Si
 
4
O
 
10
 · H
 
2
O
System:OrthorhombicColour:pale blue to very light ...
Hardness:5
Name:The mineral is named for its essential Pb content and its silicate sheet structure (Greek φύλλον = leaf).


Structurally related to pentagonite.

Classification of Plumbophyllite

IMA status:Approved 2008
Nickel-Strunz 10th (pending) edition ID:9.EA.85

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
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Type Occurrence of Plumbophyllite

Type Locality:Blue Bell claims (Hard Luck claims), Baker, San Bernardino Co., California, USA
Place of Conservation of Type Material:Natural History Museum of Los Angeles County, catalog numbers 58829, 58830, 58831, and 58832 (cotypes)
Year of Discovery:2000
Geological Setting of type material:Oxidation zone
Associated Minerals at type locality:
WulfeniteSepioliteQuartzPlumbotsumiteOpal
MimetiteGypsumGoethiteFluoriteChrysocolla
Cerussite

Physical Properties of Plumbophyllite

Lustre:Vitreous
Diaphaneity (Transparency):Translucent
Colour:pale blue to very light blue-green
Streak:white
Hardness (Mohs):5
Tenacity:Brittle
Cleavage:Perfect
{100}
Fracture:Splintery
Density (measured):3.96(5) g/cm3
Density (calculated):3.940 g/cm3

Crystallography of Plumbophyllite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pbcn {P21/b 2/c 21/n}
Cell Parameters:a = 13.2083Å, b = 9.7832Å, c = 8.6545Å
Ratio:a:b:c = 1.35 : 1 : 0.885
Unit Cell Volume:V 1,118.33 ų (Calculated from Unit Cell)
Morphology:Plumbophyllite forms prismatic crystals, elongate on c, with wedge-shaped terminations
X-Ray Powder Diffraction:
d-spacingIntensity
7.883 (97)
6.625 (35)
4.897 (38)
3.623 (100)
3.166 (45)
2.938 (57)
2.555 (51)
2.243 (50)

Optical Data of Plumbophyllite

Type:Biaxial (+)
RI values: nα = 1.674(2) nβ = 1.684(2) nγ = 1.708(2)
2V:Measured: 66° , Calculated: 66.5°
Maximum Birefringence:δ = 0.034

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:High
Dispersion:Strong r > v dispersion
Pleochroism:Non-pleochroic

Chemical Properties of Plumbophyllite

Formula:
Pb
 
2
Si
 
4
O
 
10
 · H
 
2
O
Essential elements:H, O, Pb, Si
All elements listed in formula:H, O, Pb, Si

Relationship of Plumbophyllite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.EA.05Cuprorivaite
CaCu[Si
 
4
O
 
10
]
9.EA.05Gillespite
BaFe
2+
 
[Si
 
4
O
 
10
]
9.EA.05Effenbergerite
BaCu[Si
 
4
O
 
10
]
9.EA.05Wesselsite
SrCu[Si
 
4
O
 
10
]
9.EA.10Ekanite
(Ca,Fe
2+
 
,Pb)
 
2
(Th,U)[Si
 
8
O
 
20
]
9.EA.15Apophyllite-(KF)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
9.EA.15Apophyllite-(KOH)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
9.EA.15Apophyllite-(NaF)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
9.EA.20Magadiite
NaSi
 
7
O
 
13
(OH)
 
3
 · 3H
 
2
O
9.EA.25Dalyite
K
 
2
ZrSi
 
6
O
 
15
9.EA.25Davanite
K
 
2
TiSi
 
6
O
 
15
9.EA.30Sazhinite-(Ce)
Na
 
3
Ce[Si
 
6
O
 
15
] · 6H
 
2
O
9.EA.30Sazhinite-(La)
Na
 
3
La[Si
 
6
O
 
15
] · 2H
 
2
O
9.EA.35Armstrongite
CaZr[Si
 
6
O
 
15
] · 3H
 
2
O
9.EA.40Okenite
CaSi
 
2
O
 
5
 · 2H
 
2
O
9.EA.45Nekoite
Ca
 
3
Si
 
6
O
 
15
·7H
 
2
O
9.EA.50Cavansite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.55Pentagonite
Ca(VO)Si
 
4
O
 
10
 · 4H
 
2
O
9.EA.60Penkvilksite
Na
 
4
Ti
 
2
Si
 
8
O
 
22
 · 4H
 
2
O
9.EA.60Tumchaite
Na
 
2
Zr(Si
 
4
O
 
11
) · 2H
 
2
O
9.EA.65Nabesite
Na
 
2
BeSi
 
4
O
 
10
 * 4 H
 
2
O
9.EA.70Ajoite
(K,Na)Cu
 
7
AlSi
 
9
O
 
24
(OH)
 
6
 · 3H
 
2
O
9.EA.75Zeravshanite
Na
 
2
Cs
 
4
Zr
 
3
[Si
 
18
O
 
45
]*2H
 
2
O
9.EA.80Bussyite-(Ce)
(Ce,REE)
 
3
(Na,H
 
2
O)
 
6
MnSi
 
9
Be
 
5
(O,OH)
 
30
F
 
4

Other Names for Plumbophyllite

Synonyms:
IMA2008-025
Other Languages:

Other Information

Fluorescence in UV light:None
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 Plumbophyllite

Reference List:

- +
Anthony R. Kampf, George R. Rossman, and Robert M. Housley (2009) Plumbophyllite, a new species from the Blue Bell claims near Baker, San Bernardino County, California. American Mineralogist, 94, 1198–1204.


http://minerals.gps.caltech.edu/Manuscripts/2009/Plumbophyllite/Index.html

Internet Links for Plumbophyllite

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    • Localities for Plumbophyllite

    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.
    Australia
     
    • Queensland
      • Mount Isa - Cloncurry area
        • Mount Isa district
          • Mount Isa Mines
    		R Bottrill (unpub data)
    USA
     
    • California
      • San Bernardino Co.
        • Baker
    		American Mineralogist, Volume 94, pages 1198–1204, 2009
    Mineral and/or Locality
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